squad vs crew

squad and crew both are nouns.

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

As nouns, crew is a hyponym of squad; that is, crew is a word with a more specific, narrower meaning than squad:

squad (noun)	crew (noun)
a cooperative unit (especially in sports)	an organized group of workmen
a smallest army unit	the men and women who man a vehicle (ship, aircraft, etc.)
a small squad of policemen trained to deal with a particular kind of crime	the team of men or women manning a racing shell
	an informal body of friends

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