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/ˈæstɹəˌnɔːt/ · noun
A member of the crew of a spaceship or other spacecraft that travels beyond Earth's atmosphere, or someone trained to serve that purpose..
Use astronaut when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Astronaut means A member of the crew of a spaceship or other spacecraft that travels beyond Earth's atmosphere, or someone trained to serve that purpose..
Common synonyms include cosmonaut, spaceman.
The opposite depends on the specific sense.
Use astronaut where its definition matches the intended context.
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