crewman vs crew

crewman and crew both are nouns.

Word	Noun	Adjective	Verb	Adverb
crewman	Yes	No	No	No
crew	Yes	No	Yes	No

crewman (noun)	crew (noun)
a member of a work crew	an organized group of workmen
a member of a flight crew	the men and women who man a vehicle (ship, aircraft, etc.)
any member of a ship's crew	the team of men or women manning a racing shell
	an informal body of friends

crewman (verb)	crew (verb)
	serve as a crew member on