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pacemaker(anatomy) Specialized cells which stimulate the heart to beat.paganiserAlternative form of paganizer.pageanterOne who takes part in a pageant.painmakerSomething that causes pain.paintoverAn instance of painting over the top of something, such as an existing artwork or a graffiti tag.palampoorAlternative form of palampore.palavererOne who palavers.palinavir(pharmacology) A protease inhibitor.palliatorAn apologist; one who justifies or excuses atrocities by citing extenuating circumstances or positive aspects.palmisterOne who practices palmistry.panacinar(pathology) Affecting all the acinipancancerRelating to all cancers, or all types of cancer.pangenderEncompassing or including all genders.pantmaker(US) someone who makes pants (trousers)papalizer(rare) One who papalizes.papolaterOne who worships the Pope; an extreme papist.parabolar(obsolete, mathematics) parabolicparabularRelating to, or in the form of, a parable.paradiverA military operative who is dropped from an aircraft into water, combining the roles of paratrooper and frogman.paradoxerPerson who comes up with a paradox.parahilar(anatomy) Above or behind a hilumparalyserThat which paralyses.paralyzerOne who or that which paralyzesparameter(sciences) A variable that describes a property or characteristic of some system (material, object, event, etc.) or some aspect thereof.paramotorA steerable parachute powered by a propeller attached to the pilot's backparboilerA person or machine that parboils.parfumierA maker or seller of perfumes.partygoerSomeone who attends a party or parties.partywearClothing to be worn at parties.parvorder(taxonomy) A specific taxonomic category above superfamily and below infraorder.pasquilerOne who lampoons.passengerOne who rides or travels in a vehicle, but who does not operate it and is not a member of the crew.patballerOne who plays patball.pathmakerOne who, or that which, makes a way or path.patiromerAn oral medication used to treat high blood potassium levels.patrollerOne who patrols.patternerSomeone who or something which makes or uses a pattern.paunchiercomparative form of paunchy: more paunchypayloaderA front-end loader.paymasterAn official in charge of payments to employees, troops, etc.payrollerSomeone on a payroll; someone who earns a salary.peasouperAlternative form of pea-souper.peculatorA person who peculates; an embezzler.pedaliter(music) Of organ music requiring the use of both the manuals and the pedalspedicularOf or relating to lice.pedometerA device, often electronic, that measures the number of steps taken, and thus estimates the distance walked.pedomotor(historical) A two-wheeled vehicle propelled by the feet, a forerunner of the bicycle.penalizerOne who or that which penalizes.pencillerAlternative form of penciler.pencionerObsolete form of pensioner.pendicler(Scotland) An inferior tenant; one who rents a pendicle or croft.penholderA handle into which a nib or other penpoint is fitted to form a pen.penkeeperThe person in charge of a pen in which animals are kept.penpusherAlternative form of pen-pusher.pensioner(by extension) Someone who is at the age at which one typically receives a pension; an elderly person.pentander(botany, obsolete) Any plant of the former class Pentandria, having five stamens.pentester(computing) Someone who performs a pentest (a penetration test)peramivir(pharmacology) A neuraminidase inhibitor being developed as an antiviral drug to treat influenza.perceiverOne who perceives.percenter(in combination, preceded by a number) A member of a group that forms a specified percentage of a population.perceptorThat which perceives.percussor(medicine) A small hammer-like tool that a physician uses to provide a light blow to a body part.percuteurA medical instrument for therapeutic or diagnostic percussion.perfectercomparative form of perfect: more perfectperfectorOne who perfects.perfervorThe state of being perfervid; passion; zealotry.perfesserPronunciation spelling of professor.performerOne who performs for, or entertains, an audience.perfumierAlternative form of parfumier.periaugerAlternative form of pirogue (“a kind of boat”).perihilar(anatomy) Surrounding the hilum.perilobar(anatomy) Around a lobe.perimeter(mathematics) The sum of the distance of all the lengths of the sides of an object.peripolarSurrounding a (magnetic or electric) poleperitalar(anatomy) Surrounding the talusperituberAlternative form of perituberal.peritumorSurrounding a tumorperiulcerSurrounding an ulcerpermabear(finance, informal) An investor who consistently acts in the expectation that the value of stocks and shares will fall regardless of market conditions.permeatorA device, containing a semipermeable membrane, used to desalinate water by reverse osmosispermitterOne who permits.perpenderA perpend stone.perplexerOne who perplexes.persisterSomething that persistspersistor(sociology) A person who persists in unsocial behaviourperspirerA person who perspires (sweats).persuaderOne who, or that which, persuades, literally or figuratively.perturberOne who or that which perturbs.pervalvarperpendicular to the centre of the valve face of a diatomperverterSomeone or something that perverts.petaliter(US) A unit of volume equivalent to 10¹⁵ liters. Symbol: PlpetameterUS spelling of petametre.petardeerAlternative form of petardier.petardier(military, historical) One who managed a petard.petkeeperOne who keeps a domestic animal, or pet.petnapperOne who steals or abducts a pet (domestic animal).petrichorThe distinctive scent, caused by geosmin, which accompanies the first rain after a long, warm, dry spell.petrifierperson or other object that petrifies, either literally or figuratively.petroleurOne who lights fires with petrol, especially (historical) a revolutionary who attacked public buildings in this way in Paris in 1871.petsitterOne who acts as babysitter for a pet in the owner's absence.pewholderOne who has a pew reserved for themselves in church.phalangerAn arboreal marsupial of the family Phalangeridae, native to Australia.phansigar(historical) A thug (member of band of assassins in India).philiater(archaic, rare) A person with an interest in practising medicine.phoropterAn instrument used in eye examinations to determine an individual's prescription, the patient looking through various lenses at a chart on the other side.photopair(physics) A pair of photons, produced simultaneously, typically moving in opposite directionsphylacter(obsolete) Synonym of phylactery.physicker(dated, colloquial or dialect) A physician; a doctor.phytoagarA form of agar made from terrestrial plantsphytosaurAny of the extinct order †Phytosauria of large semi-aquatic predatory archosaurs, resembling modern crocodiles, that flourished during the Late Triassic period.pickeerer(obsolete) One who pickeers.picketeerSynonym of picketer.picnickerSomeone who has a picnic.picoliterUS spelling of picolitre.picometerUS spelling of picometre.picomolarHaving a concentration of one picomole per litre.picotiterA miniaturized form of microtiterpicqueterA person who arranges artificial flowers for a living.piepowder(British, law, historical) In full court of piepowders (also court of piepowder) or piepowder court: an ancient court in England held in conjunction with a fair or a market to administer summary justice over occurrences therein such as disputes between merchants and acts of theft and violence; they were presided over by the mayor and bailiffs of the borough, or by the steward if the fair or market was held by a lord.pigeoneerOne who trains pigeons.pigfucker(slang, vulgar, derogatory or offensive) Term of abuse.pignapper(humorous) A person who abducts a pig.pigsitter(rare) One who pigsits; one who looks after or takes care of a pig or guinea pig.pilgrimer(obsolete) A pilgrim.pilomotorRelating to the goose flesh reflex.pimodivir(pharmacology) An antiviral drug developed as a treatment for influenza.pinballerA player of pinball.pineasterArchaic form of pinaster.pinfingerSynonym of knife game.pinholderA decorative holder for flowers, having a round base with a set of pins projecting upward.pinhookerA speculator who buys and sells tobacco.pinsetter(bowling, originally) The person who clears fallen pins and resets them in tenpin bowling or candlepin bowling.pipelayerOne who lays conducting pipes in the ground, for water, gas, etc.pipelinerOne who works on oil pipelines.pipemakerA person who makes pipespiqueererRare form of pickeerer.pirameterAlternative form of peirameter.pisswaterAlternative spelling of piss water.pistillar(botany) Of or relating to a pistil.pistoleerA person, especially a soldier, armed with a pistolpistolierAlternative spelling of pistoleer.pistosaurAny extinct reptile of the genus PistosauruspithivierA pie or cake consisting of two puff pastry rounds enclosing frangipane and often fruit (if a dessert) or meat, etc.pitmasterOne who operates a barbecue pit. Sometimes a term of respect for someone who is skilled at barbecuing.pitometer(nautical) A log (speed measuring device) somewhat similar to a pitot tube.pittancer(historical, Christianity) A person responsible for distributing small gifts on religious occasions.pixelatorA machine, tool, or algorithm that blurs images or videos into pixels.placardera person who posts bills or puts up placards or postersplagiator(uncommon) Synonym of plagiarist.plaidoyer(chiefly law) An act of pleading; a plea.plamasserA person who convinces another to do something by means of sweet talk and flattery.planeteerSomeone who helps protect the environment.planisherOne who, or that which, planishes.plasmator(obsolete) One who forms or creates; creator.plastererA person whose occupation is to plaster walls.platooner(sports) A player who platoons.playactorAlternative form of play-actor.playmaker(sports) A sportsman who leads attacks for his team and creates chances to score.pleasurerSomeone or something who pleasures.plummeterOne who plummets.plundererOne who plunders or pillages.pneometer(obsolete) A pneumatometer.podcasterOne who podcasts.poddinger(now rare, Northern England in later use) Synonym of porringer (“a small cup or bowl”).podficcer(fandom slang) A fan who records podfics.poetasterAn unskilled poet.polariserNon-Oxford British English standard spelling of polarizer.polarizerOne who polarizes; one who divides a group or community into two extremes.polespearAn underwater tool used in spearfishing, consisting of a pole, a spear tip, and a rubber loop.polissoirA groove found carved into rock, once used to polish stone axes.polltakerOne who gathers responses to a poll.poloxamer(chemistry) Any of a family of copolymers of two long chains of ethylene oxide and a central chain of propylene oxide that are used as nonionic surfactants.polyander(obsolete) Any plant of the class Polyandria.polychoirRelating to more than one choir.polyesterAny polymer whose monomers are linked together by ester bondspolyether(organic chemistry) a polymer, such as an elastomer, in which carbon atoms of the repeating units are joined by a single oxygen atompolygonar(rare) polygonalpolylobarHaving or involving multiple or many lobes.polymeterAny of several measuring devices.polypifer(biology) Any colonial organism, such as coral, formed from polypspolysugarpolysaccharidepolywater(pseudoscience) A supposed polymeric form of water reported to have been produced in fine capillaries; now known to be illusory.pomewaterA kind of sweet, juicy apple.pompadourA women's hairstyle in which the hair is swept upwards from the face and worn high over the forehead.pondwaterThe water in a pond.pontoneerAlternative form of pontooner.pontonierAlternative form of pontooner.pontoonerOne who constructs a pontoon.pontosaurAny extinct pythonomorph of the genus †PontosauruspoolwaterThe water in a pool.populatorOne who, or that which, populates.populiserAlternative form of populizer.populizerA person who can communicate technical or scientific ideas to a general publicporewater(geology) The water that fills the pores between the grains of sediment etc.pornmakerSomeone who creates pornography, a pornographerporometer(botany) A device that measures the areas of the pores of a leaf (by measuring the amount of gas passing through it)porrengerObsolete form of porringer.porringerA small cup or bowl, usually with a handle, commonly used for porridge.portainerA crane for moving shipping containers.portenderOne who or that which portends.portionerA person who receives a portion or share of somethingportrayerAgent noun of portray; one who portrays.portsider(sports) A left-handed pitcher, boxer, hockey player, etc.; a southpaw.possesserAlternative form of possessor.possessorAgent noun of possess; one who possessespostdauerA stage in the development of nematode larvae following dauer; the organism at this stage.posterior(anatomy) Nearer the rear or hind end; nearer the caudal end of the body in quadrupeds or the dorsal end in bipeds.postfaderAfter audio processing by a fader.postiller(archaic) A writer of notes in the margin of a book.postmolar(medicine) Occurring after a hydatidiform mole (that is, after a molar pregnancy), as for example postmolar choriocarcinoma.postofferAfter an offer has been made.postorder(computing theory) Of a tree traversal, recursively visiting the left and right subtrees before the root.postponerOne who postpones.postriderOne who rides over a postroad to carry the mails.posttumorFollowing (removal of a) tumor.postulnar(anatomy) posterior to the ulnapostvelar(phonetics) Having an articulation intermediate between velar and uvular.potboilerAlternative spelling of pot boiler.pothangerpothook (hook used to suspend a cooking-pot)potholderAn insulated pad used for handling hot cooking utensilspothunterA person who hunts animals for food (for the pot) rather than as sport.potlicker(Canada, US, Caribbean) A mongrel dog.potlikkerAlternative spelling of pot liquor.potometerA device used for measuring the rate of water uptake of a leafy shoot due to photosynthesis and transpiration.pottingar(obsolete) An apothecary.pottingerSynonym of porringer (“a small cup or bowl”).potwaller(now historical) A man with his own fireplace where a pot of water could be boiled, thus qualifying him to vote in a parliamentary election in certain English boroughs before the 1832 Reform Act.potwasherA person who washes pots and dishes, especially in a restaurant; a dishwasher.poultererA dealer in poultry.poxvectorThe vector of a poxviruspracticerAlternative form of practiser.practiserOne who practises.pranksterOne who performs pranks.preachiercomparative form of preachy: more preachypreacinarPrior to the formation of an acinusprebuffer(computing, transitive) To place into a buffer in preparation for later retrieval or playback.preburner(aeronautics) A combustion chamber of a bipropellant rocket engine.precancerBefore the onset of cancer.precensor(transitive) To censor in advance.precentorThe person who leads songs or prayers in a cathedral, church, monastery, or synagogue and generally facilitates worship.preceptorA teacher or tutor.precessor(obsolete) A predecessor; one who came before.precoolerA device that precools things before they are placed into a cooler or fridge.precurrerObsolete form of precursor.precursorThat which precurses: a forerunner, predecessor, or indicator of approaching events.predicterAlternative form of predictor.predictorSomething that anticipates, predicts, or foretells.predinnerOccurring before or in preparation for dinnerpreemptorSomeone who preempts; especially one who appropriates public land.prefabber(informal) prefabricatorprefactorA coefficient which precedes a given quantity in a mathematical formulapreferrerA person who prefers (a stated person or thing).prefillerA machine or device that fills something in advance.prefilter(transitive) To filter in advance.preflower(botany) A growth in the internode of a plant that develops into a flowerpregenderBefore (the advent or consideration of, or division by) gender.preheaderMaterial that precedes a header.preheaterAn engineering device that preheats a material prior to some other process.prehensorOne who, or that which, takes hold; a grasping limb etc.preighter(aviation) A freighter converted from a passenger aircraft.prejudgerOne who prejudges.prejuniorRelating to a school that caters for very young children (infants)prelabourBefore the onset of labour.prelector(archaic) Someone who reads lectures or discourses; a lecturer.prelitter(transitive) To litter in (a place) in advance.preloaderAgent noun of preload; one who, or that which, preloads.prelumbar(anatomy) Situated immediately in front of the pubic region, especially of the spine.premaster(computing, transitive) To make a master copy of (data) on a hard disk before writing it to optical disc.premerger(business) Occurring or existing before a mergerpremurderHappening before a murder.prenumberTo number in advance.preocularJust in front of the eyes.preparser(computing) A software component that performs parsing in advance.prepender(computing) A software component that prepends data to a computer file.preponderTo preponderate.prepostorAlternative form of prepositor.preprayerBefore prayer.prereaderOne who reads in advance.prerenderAlternative spelling of pre-render.presbyterAn elder, priest, pastor, or minister in various Christian churches.prescaler(electronics) A counting circuit used to reduce a high-frequency electrical signal to a lower frequency by integer division.presectorA sector near the leading edge of an insect's wingpresellar(anatomy) In front of the sella turcica.presenter(radio, television) Someone who presents a broadcast programme; a compere or master of ceremonies.presentorDated form of presenter.preserverOne who preserves.presetterOne who or that which presets.pressurerOne who or that which exerts pressure.presummerBefore summer.preteenerSynonym of preteen.pretenderA person who professes beliefs and opinions that they do not hold.pretermerSynonym of preemie (“baby born prematurely”).pretesterA person who carries out a pretestprevailerAgent noun of prevail; one who prevails.preventerOne who, or that which, prevents.preventorAlternative form of preventer.previewerA person who sees a film or TV program, etc. before its general release to the public.prewinterBefore the season of winter.prewriterSomeone who prewrites.pridewearClothing that advertises its wearer's pride in being LGBT (gay pride, trans pride, etc).privateerAn advocate or beneficiary of privatization of a government service or activity.proacinarThat promotes the formation of an acinusproceederOne who proceeds.processerSomeone who processesprocessorA person or institution who processes things (foods, photos, applications, etc.).proctiger(entomology) The terminal segment of an insect's abdomen, containing the anus.procureur(law) A procurator.productorSynonym of producer.professorThe most senior rank for an academic at a university or similar institution.proffererSomeone who proffers something.proffesorMisspelling of professor.profiteer(derogatory) One who makes an unreasonable profit not justified by cost or risk, a rent-seeker.programer(American spelling, uncommon) Alternative spelling of programmer.prohaptorAn anterior haptor.projectorSomeone who devises or suggests a project; a proposer or planner of something.prolongerOne who or that which prolongs, or lengthens in time or space.promissorAlternative form of promisor.promulgerOne who promulges or publishes what was before unknown.propellerOne who, or that which, propels.propellor(US) Nonstandard spelling of propeller.propliner(aviation) A propeller-driven airliner.propmakerA manufacturer of props for use in plays or films.propretorAlternative spelling of propraetor.proprotorAny of the powered rotors of a tiltrotor aircraft.propugner(archaic) A defender, supporter, vindicator.propulsorAny object that propels or produces a propulsive force.prorectorAn officer who presides over the academic senate of a university in certain countries, especially Germany.proroguerOne who prorogues.prosateurA writer of French prose.prosectorA person who prepares a body for dissection by students, or dissects them as demonstrations.proslaverOne who supports the idea of slavery.prospererSomeone who prospersprotecterObsolete spelling of protector.protectorSomeone who protects or guards, by assignment or on their own initiative.protesterOne who protests, either alone or in a public display of group feeling.protestorAlternative spelling of protester.protostar(astronomy) A collection of gas and dust in space with high temperature that usually grows to the point of beginning nuclear fusion and becoming a star.protruderThat which protrudes.protumourAlternative form of protumor.provaxxerAlternative form of pro-vaxxer.provector(mathematics) A contravariant operator formed by substituting signs of partial differentiation for the facients of a quantic.provender(transitive) To feed.provisourObsolete form of provisor.proworkerSupporting workers.psaltererA musician who plays the psaltery.pseudoairAn artificially created gas that mimics air.pterosaurAny flying reptile, of the extinct order †Pterosauria, including the pterodactyls.pubcaster(informal, entertainment industry) A public broadcasterpubkeeperThe person responsible for the running of a pub, usually the proprietor.publisherA person or (especially) a company who publishes, especially books.puffadderAlternative form of puff adder.pulpeteerOne who writes pulp magazines or novels.pulpifierA machine that reduces material to pulp.pulpiteer(derogatory) One who speaks in a pulpit; a preacher.pulvillarLike a cushion or pad.pummellerAlternative spelling of pummeler.punctatorOne who marks with points, especially in writing Hebrew.punditeer(derogatory) A commentator or critic who is inexperienced or ignorant.pupgenderA puppy- or dog-like xenogender.puppeteerA person who uses a puppet.purchaserOne who purchases.purloinerOne who purloins.pursuiterA person (especially a cyclist) who takes part in a pursuit racepurveyourObsolete spelling of purveyor.pushchair(UK, Ireland, Commonwealth) A small carriage in which a baby or child sits and is pushed around.pushmowerAlternative form of push mower.putrefierThat which putrefies.pyrolaterA fire-worshipper.pyrolatorAlternative form of pyrolater.pyroleter(historical) A fire-extinguishing chemical apparatus by which carbonic acid is generated and thrown on the fire.pyrolizerAlternative spelling of pyrolyser.pyrolyserThat which pyrolyses; a device or reactor that carries out or produces pyrolysis.pyrolyzerAlternative form of pyrolyser.pyrometerA thermometer designed to measure high temperatures.pyroxyfurA particular fungicide.