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pacesetterOne who or that which determines the rate of action through leading.pachometerAlternative form of pachymeter.pachymeterAny of several instruments that are used to measure the thickness of something.packetizer(signal processing) A process that packetizes.paedometer(medicine) a device used to measure the weight and height of a child.pageanteerOne who produces a pageant.pageturnerAlternative spelling of page-turner.painkiller(pharmacology) A drug that numbs the pain in the body.painstakerOne who takes pains; a careful worker.paintmakersomeone who makes paintpalaeosaur(zoology) Any of various prehistoric animals that have been named Palaeosaurus.paleoriverAn ancient river (that no longer exists, or whose course has changed)pallbearerOne called upon to carry or bear the coffin or the casket at a funeral.palletizerA machine that automatically stacks cases of goods onto a pallet.palmcorderA small camcorder.palpometerAn instrument that uses ultrasound and computer technology to automate the physician's technique of palpation to determine sensitivity of some part of the patient's body.panhandlerOne who panhandles; an urban beggar who typically stands on a street with an outstretched container in hand, begging for loose change or money.panlobular(medicine) That affects the entire lobule (of a racemose gland).panmacularThroughout the entire maculapanstellarAcross the stars; throughout all star systems.pantiliner(Canada) Alternative form of pantyliner.pantometerAn instrument for measuring angles for determining elevations, distances, etc.pantomimerA pantomime performer.pantylinerA similar product designed to absorb urine for women with light bladder leakage.papermakerA person or company that makes paper.parabulbar(anatomy) Alongside the brainstemparachuterOne who uses a parachute; a parachutist.paradegoerA person attending a paradeparadoctor(rare) A doctor on a pararescue team.paraffinerA machine for sealing a product in paraffin wax.paraformer(electronics) An electrical transformer that uses magnetic inductanceparagaster(zoology) The cavity of the sac of a sponge.paragliderOne who paraglides.parajumperOne who performs a parajump.paralinear(sciences, mathematics) Consisting of the linear combination of different rate equations, each of which may or may not be linear.paralumbar(anatomy) Located next to the lumbar regionparasailerAlternative spelling of parasailor.parasellar(anatomy) Near or covering the sella turcicaparastylarRelating to the parastyleparasurferA participant in parasurfing, one who parasurfs.paratumour(pathology) Synonym of paraneoplasia.paravector(mathematics) A sum (in some algebras) of a scalar and a vector.pareiasaur(paleontology) Any member of the Pareiasauridae, a family of large parareptiles from the Permian period.parkkeeperOne who looks after a park and maintains its grounds.parkrunnerA person who takes part in a parkrun.particolorAlternative form of particolour.particularSpecific; discrete; concrete.particulerArchaic spelling of particular.passholderOne who holds a pass.passimeterA pocket pedometer.passivatorA material that inhibits corrosion of a metal surface by increasing its passivitypassivizer(linguistics) A term, in some languages, that is used to convert a verb into the passivepassometer(dated) An instrument for measuring the number of paces taken by a walker.pasticheurOne who mimics the literary or artistic style of another.pastmasterMisspelling of past master.pathetizer(archaic) A hypnotist.pathfinderOne who discovers or makes a new path or way through an untraversed region.pathmasterA person responsible for the maintenance of paths and roadways.pathometerA lie detector.patrioteer(derogatory) A vehemently patriotic person; a jingoist.patroniserAlternative spelling of patronizer.patronizerA person who patronizespauperizerOne who pauperizes.pawnbrokerA person who makes monetary loans at interest, taking personal property as security – which may be sold if not redeemed.peacemakerA person who restores peace, especially by settling disputes; one who engages in peacemaking.peashooterA toy weapon consisting of a tube through which dried peas or small objects are blown.pedicellarRelating to a pedicel.pedohunter(slang) A person who confronts paedophiles and hebephiles.peduncularOf or pertaining to a pedunclepegasister(slang) A female fan of the animated television series My Little Pony: Friendship Is Magic, typically an adult.peirameter(dated) A dynamometer for measuring the force required to draw wheel carriages on roads of different constructions.pelagosaurAny of the extinct crocodile-like animals of genus †Pelagosaurus which lived during the Jurassic period.pelletiserAlternative form of pelletizer.pelletizerA machine that converts a material into pellets.pellicularOf or pertaining to a pellicle (a pellicula).peltmongerA dealer in pelts (animal skins).pelvimeterAn instrument for measuring the pelvis.pelycosaurAny of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade, formerly regarded as order Pelycosauria.penannularForming an almost complete ring, but with a break or opening.penetratorSomething that penetrates.peninsularOf, pertaining to, resembling, or connected with a peninsula or peninsulas.penitencer(obsolete) A priest who heard confession and enjoined penance in extraordinary cases.pentacolorHaving five colors.pentacularOf or relating to a pentacle.pentalayerHaving five layerspentameter(poetry, countable) A line in a poem having five metrical feet.peptidimerA dimeric peptidepercolatorA device used to brew coffee by passing boiling water through coffee grounds.perfervourAlternative form of perfervor.perforatorA tool or machine that makes holes, or perforates, materials such as paper and card.periacinarAlternative form of periacinal.peribulbarAround the brainstem.peribullarSurrounding a bullapericenter(astronomy) The point of closest approach of an astronomical object in an elliptical orbit to its center of attraction.peridiolarRelating to the peridiolum.perinsular(anatomy) Around the insula of the brain.periocular(anatomy) Surrounding the eyeball.periovular(anatomy) Surrounding an ovaryperiplanar(chemistry) Describing a torsion angle between 0° and 30°, or between 150° and 180°peristylarHaving the form of a peristyle.peritumourAlternative form of peritumor.periuvular(anatomy) Around the uvula.perivalvarAround a valve.perivulvar(biology) Surrounding a vulva (of a nematode)permaboner(slang) A penis that is persistently erect; a prolonged erection.permutator(electricity) A special form of rotary converter with stationary commutator and rotating brushes, in which the exciting field is induced by the alternating current in a short-circuited magnetic core instead of being produced by an external magnet.permutizer(mathematics) A subgroup of all cyclic subgroups that permute with anotherperruquierA maker of perukes or wigs.persecutorA person or thing that persecutes or harasses.persevererOne who perseveres.persifleurOne who participates in light, playful talk or banter or persiflage.personatorOne who personates.perticularObsolete form of particular.petiolular(botany) Of or relating to a petiolule.petitioner(law) Someone who presents a petition to a court.pettiaugerAlternative form of pirogue (“a kind of boat”).pettyaugerAlternative form of pirogue (“a kind of boat”).phacometerA device for testing the refractive power of lenses.phakometerAlternative form of phacometer.phanseegarAlternative form of phansigar.phasemeterA device for measuring the difference in phase of two alternating currents of electromotive forces.phasometerAlternative form of phasemeter.philodoxerOne who is interested in opinions or beliefs, rather than facts.philologer(archaic) A philologist.phlyctenarOf relating to a phlyctena.phonemakerA telephone manufacturer.phonicator(humorous, slang, sometimes derogatory) An educator who champions the use of phonics instruction as a method of beginning or remedial reading instruction, often used as a self-referent.phonologer(archaic) A phonologist.phonometerA particular instrument for measuring the force of sounds.phonomotor(physics, historical) An instrument in which motion is produced by sound waves.phorometer(historical) A device for examining the equilibrium of the ocular muscles.photodimer(chemistry) Any dimer created by photodimerizationphotometer(physics) Any of several instruments used to measure various aspects of the intensity of light.photomotor(physiology) Relating to movement in response to lightphotopaperPhotographic paper; paper coated with light-sensitive chemicals, used for making photographic prints on traditional film cameras.photoradarA radar-based technology used in speed cameras.phycomater(obsolete) A gelatin in which the algae spores have been supposed to vegetate.phytometerAny plant used as a phytometric standardpicknickerArchaic form of picnicker.piermasterThe person in charge of a pier.piezometerAn instrument used to measure pressure.pigeonnierA dovecote, especially in France.pigstickerA large knife, used as a weapon.piledriver(soccer) A very hard shot.pillowbeer(now Northern England, US regional) A pillowcase.pillowbierAlternative form of pillowbeer.pinfeatherA developing feather as it emerges through the skin.pinnacularOf, related to, or resembling a pinnacle.pinpointerOne who or that which pinpoints.pinspotterSynonym of pinsetter (“person or machine that resets fallen pins”).pinstriperA person who paints pinstripes.pipecutterAlternative form of pipe cutter.pipefitterAn industrial tradesman who installs and maintains piping systems.pipesmokerOne who smokes a pipe.pipeworkerA person who installs pipework (in factories, power stations etc)pirouetterOne who pirouettes.pisscutter(US, military, slang, vulgar) A side cap.pitchmeter(nautical, aviation) A device, encompassing a clinometer, used for measuring the pitch of a vehicle, especially a ship or aircraft.pixellatorAlternative form of pixelator.pizzamakerOne who makes pizza.placemakerA person involved in placemaking.planemakerA company that manufactures (commercial) aircraft.planholderThe customer who has purchased a plan, such as a pension or insurance plan.planimeterAn integrating device used to measure the area of an irregular figure via tracing its outline.plankowner(nautical) A member of the crew of a navy ship when it was placed on commission.planometerA flat, metal plate used for estimating the flatness of a machined part; a surface plate.plansifterA tiered set of sieves used in milling.planteaterA herbivorous animal.plastifierA chemical agent that causes other chemical compounds to react to form a plastic.platelayer(rail transport) A railway employee who inspects and maintains the permanent way of a railway installation.platemakerOne who produces plates (printing surfaces).plateosaurA plateosaurid dinosaur of the genus Plateosaurus that lived during the Late Triassic period.platformer(video games, informal) A platform game.platoniserAlternative form of platonizer.platonizerOne who platonizes.platymeter(historical) An apparatus for measuring the capacity of condensers, or the inductive capacity of dielectrics.playboaterOne who takes part in playboating.playbrokerAn agent involved in procuring and selling theatrical plays.playcenterAlternative form of playcentre.playleaderOne whose occupation is to encourage children to play together and to suggest games.playreaderA person employed to read the scripts of plays before they are staged.playtesterOne who playtests a game.playworker(UK) A childcarer involved in playwork.playwriterOne who writes plays; a playwright.pleasantercomparative form of pleasant: more pleasantplegometer(historical) A device for measuring the force of a blow or stroke.plenilunarOf, pertaining to, or resembling the full moon.plerixaforAn immunostimulant used to mobilize hematopoietic stem cells in cancer patients.plesiosaurAny of the order †Plesiosauria of extinct marine reptiles, from the Jurassic and Cretaceous periods.pleurosaurAny of the genus †Pleurosaurus of extinct reptiles.pleximeter(medicine) Something used to absorb the energy generated by the strike from a percussion hammer, during medical percussion. Usually this is simply the doctor's hand.plexometerAlternative form of pleximeter.plicometerAn instrument used in plicometryplotholderA person who holds a plot of land.plumassierSomeone who prepares or deals in ornamental plumes or feathers.pluralizer(grammar) A syntactic marker that indicates something is plural; a plural marker.pluripolar(microbiology) Having several poles instead of just two (said of mitosis, a cell undergoing mitosis, or the spindle apparatus).plyscraperA skyscraper made (at least partly) of wood; a mass timber building.podcatcher(Internet) A podcast client; a device, or software, that can receive a podcast.poindexterAlternative letter-case form of Poindexter.pointmaker(historical) A manufacturer of laces for fastening clothing.poissonierAlternative form of poissonnier.polesitter(motor racing) A driver placed in pole position.polesmoker(vulgar, slang, derogatory, offensive) Alternative form of pole-smokerpoletimber(forestry) Wood cut from trees of sufficient diameter to form poles, but smaller than sawtimber.policewearClothing to be worn by police officers.politainerA politician who is or used to be an entertainer.politickerOne who politicks; one who engages in politicking to increase their stature or power within a (non-governmental) business, organization, profession, etc.polleniserAlternative form of pollenizer.pollenizerA plant that provides pollen.pollinator(biology) the agent that pollinates a plant; often an insectpolliniserAlternative form of pollenizer.pollinizerAlternative form of pollenizer.polyabuserOne who engages in polyabuse.polyflower(of honey) Produced from multiple types of flower.polygenderHaving a mixture of genders; neither purely male nor purely female.polyhistorSomeone gifted or learned to a great extent or in multiple disciplines; a great scholar.polylinear(mathematics) Involving many linear functionspolylinker(genetics) A short sequence of DNA containing several restriction enzyme recognition sites that is contained in cloning vectorspolyovularContaining many ovulespolyphaserA machine generating more than one pressure wave.pondskaterAlternative spelling of pond-skater.ponticular(anatomy) Of or pertaining to the ponticuluspontonnierSynonym of pontooner.pontooneerAlternative form of pontooner.poormaster(historical) A person employed to validate the claims of people applying for relief, and to issue the funds where applicable.porkburgerA burger made with pork instead of beef.porknockerAlternative spelling of pork-knocker.portmapper(computing) A software service that maps programs to the ports they will use to communicate over a network.portmasterAn official in charge of running a port.portraitor(rare) One who makes portraits.positionerThat which positions.possessourObsolete form of possessor.postboomerAfter the baby boomers.postbulbar(anatomy) distal to the duodenal bulbpostcancerAfter the onset of cancer.postcareerFollowing the end of one's current or primary careerpostcursor(telecommunications) Of intersymbol interference: caused by the preceding symbol.postdictorEvidence of postdictionposteditorOne who postedits.posteriourObsolete form of posterior.postfiller(computing) In text processing systems, a pattern of text that is expected to occur after the portion of interest.postfilterTo filter after some other process.postgender(Having moved) beyond gender; not (any longer) gendered.postholderThe holder of a post (title).postlumbar(anatomy) Situated posterior to the lower back or loins.postmasterThe head of a post office.postmerger(business) Occurring after a mergerpostmurderhappening after a murder.postocularSituated behind the eyes.postpunkerAn aficionado of postpunk music.postshowerAfter taking a shower.postulatorA person who postulates something as the basis of an argument.potlatcherOne who holds a potlatch, a traditional giving-away ceremony among certain coastal peoples of the Pacific NorthwestpotstickerA kind of pan-fried dumpling in East Asian cuisines.pouchmakerA manufacturer of pouches.poundmaker(Canada, US, Amerind culture) One who makes buffalo pounds.pourparler(dated) parley (diplomatic consultation)powderizerA machine that powderizes.powerchairA motorized wheelchair.pradefovir(pharmacology) A particular antiviral drug.praelectorAlternative form of prelector.praeocular(zoology) Alternative form of preocular.praepostor(British) a prefect in some public schoolspreambularHaving the characteristics of a preamble.prebreakerAn industrial machine that is used in food processing for the initial grinding or breaking up of large (often frozen) chunks.prebreederAn immature animal (that has not yet produced offspring)precentour(obsolete) Rare spelling of precentor.preceptourObsolete form of preceptor.prechamberThe area around the spark plug in a cylinder of an internal-combustion engine (or in the cylinder head of a diesel engine) where combustion beginsprechopper(surgery) A device for prechopping.precleanerA device or component that performs preliminary cleaning.preconizerOne who preconizes.preconquer(rare) To conquer beforehand.precotylaranterior to a cotylepredeliver(transitive) To deliver in advance.predicatorThat which predicates; that designates a property or relationshippredivider(electronics) Synonym of prescaler.prefetcher(computing) A system or process that prefetches data.prejudicerOne who prejudices.prelaminar(anatomy, of the intraocular part of the optic nerve) immediately anterior to the lamina cribrosa of the sclerapremacularIn front of the maculapremodular(US, military) Before the reorganization of the United States Army into modular brigades.premonitorOne who, or that which, gives premonition; a harbingerprenuclear(history) Occurring before the start of the nuclear age.preparatorA person who prepares specimens or exhibitspreplannerOne who plans something in advance.prepolymer(organic chemistry) Any oligomer or other macromolecule that is capable of further polymerization.prepositor(education, chiefly historical) A scholar appointed to inspect other scholars; a monitor or prefect.preregular(topology, of a space) In which any two topologically distinguishable points can be separated by neighbourhoodspresatovir(pharmacology) The antiviral drug N-[2-[(2S)-2-[5-[(3S)-3-aminopyrrolidin-1-yl]-6-methylpyrazolo[1,5-a]pyrimidin-2-yl]piperidine-1-carbonyl]-4-chlorophenyl]methanesulfonamideprescriberA person who prescribes medication (usually a physician, physician assistant, or nurse practitioner).presecularPrior to a secular era.presentoirAn ornamental tray, dish, etc. used as a salver.prestellar(astronomy) Describing the matter and conditions involved in the formation of a starpretheaterBefore attending the theater (especially of drinks or a meal).pretoddlerA child who is not yet a toddler.pretrigger(electronics) Prior to the activation of a trigger.prettifierOne who or that prettifies.pretubular(anatomy) upstream of the renal tubulespricemaker(gambling) A person who determines the odds to be offered to bettors.primipilar(Ancient Rome) Of or relating to the captain of the vanguard of a Roman army.princeliercomparative form of princely: more princelyprintanier(postpositive) Prepared with spring vegetables.printmakerA person who makes prints of works of art, (particularly) a self-employed craftsman.prisonwearClothes to be worn by inmates of a prison.pritelivir(pharmacology) A particular antiherpetic drug.privatiserAlternative spelling of privatizer.privatizerOne who, or that which, privatizes.privilegerOne who confers a privilege.prizegiverOne who awards a prize.probacularRelating to probaculaprochoicerAlternative spelling of pro-choicer.proclaimerOne who proclaims.procreater(one that begets offspring): Synonym of breeder.procreatorOne who procreates; a father or mother.procuratorA tax collector.professourArchaic form of professor.proffessorMisspelling of professor.profoundercomparative form of profound: more profoundprofunctor(mathematics) A generalization of a relation in category theoryprogenitorA forefather, any of a person's direct ancestors.programmer(computing) One who writes computer programs.progresserAlternative form of progressor.progressorA person who makes progress, or facilitates progress in others.prohibiterSomeone who prohibits or forbids.prohibitorOne who prohibits.projectourObsolete form of projector.proleaguer(historical) A supporter of the League of Nations.prolocularRelating to the proloculusprolocutorA spokesman, one who speaks on behalf of others.prologizerSomeone who prologizes; a sayer of a prologue.promenaderAgent noun of promenade; one who promenades.pronouncerOne who pronounces.pronuclear(not comparable) Of or pertaining to the pronucleus.propachlor2-chloro-N-isopropylacetanilide, a herbicide that acts on annual grasses and some broadleaf plants.propagatorA person who disseminates news or rumourpropagularRelating to or composed of propagules.prophesierA person who makes prophecies or foretells the future; a prophet.proplifterA person who engages in proplifting.propmasterA person in charge of cinematic props.propounderOne who propounds.propraetorA magistrate of ancient Rome who governed a province after serving as a praetor in Rome.proproctor(UK) An assistant proctor in a university.proregular(mathematics) Having the property that the inverse systems of the Koszul cohomology modules satisfy the Inverse limit#Mittag-Leffler condition.)proscriberOne who, or that which, proscribes, denounces, or prohibits.prosecutorA prosecuting attorney.proselyterA person who proselytes; a proselytizer.proselytorA proselytizer, one who proselytes.proseminarA seminar that is open to (and accessible to) upper level undergraduates; contrasts with a graduate seminar (for graduate students only), which assumes more background.proshipperAlternative form of pro-shipper.prosopylarRelating to a prosopyleprospectorA person who explores or prospects an area in search of mineral deposits, such as gold.prostraterAlternative form of prostrator.prostratorA person who prostratesprotectourObsolete form of protector.protocolarAlternative form of protocolary.protofiberThe form of a spun plastic that forms into a fiberprotolunarThat will develop to form a moonprotosolar(astronomy) Describing the conditions prior to the formation of the solar system, or describing the protostar that became the sunprototyperOne who, or that which, prototypes.protracterrare spelling of protractorprotractorOne who, or that which, protracts, or causes protraction.proveditorOne employed to procure supplies, as for an army, a steamer, etc.; a purveyor; one who provides for another.provocatorOne who engages in provocation.psalmisterSynonym of psalmist.pseudostarAny light in the sky that may be erroneously identified as a star.psychiater(archaic) A psychiatrist.psychophor(historical) A metal device that sits against the prostate and perineum, through which cold water is run, used to treat impotence and excessive masturbation.publicizerA person who publicizes.pudknocker(aviation slang) A pretentious but unskilled pilot.pudwhacker(slang, derogatory) An annoying or contemptible person.pulmometer(archaic) A kind of historical spirometer.pulsimeterA sphygmograph.pulsometerA vacuum pump or hydrotrope.pulveratorA device for pulverising material.pulveriserAlternative spelling of pulverizer.pulverizerOne who, or that which, pulverizes.pulvinularRelating to a pulvinuluspumpkineerOne who grows giant pumpkins, generally for the purpose of entering contests.punctiliar(grammar) Of or pertaining to an unextended point of time:punctuatorOne who punctuates, as in writing.pursemakerA manufacturer of purses.pycnofiberUS standard spelling of pycnofibre.pycnometer(physics, metrology) A vessel of precisely known volume used by weighing to determine the specific gravity or relative density of a liquid.pyknometerAlternative form of pycnometer.pyromancerOne who performs pyromancy.pyrosilver(historical) electroplated ware in which the silver is made to sink into the pores of the plated baser metal by the action of heat