gang vs ground crew

gang and ground crew both are nouns.

Word	Noun	Adjective	Verb	Adverb
gang	Yes	No	Yes	No
ground crew	Yes	No	No	No

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

gang: an organized group of workmen
ground crew: the crew of technicians and mechanics who service aircraft on the ground

Other hyponyms of gang include shift, detail, chain gang, ground-service crew, road gang, section gang, stage crew.

gang (noun)	ground crew (noun)
tool consisting of a combination of implements arranged to work together	the crew of technicians and mechanics who service aircraft on the ground
an organized group of workmen
an association of criminals
an informal body of friends

gang (verb)	ground crew (verb)
act as an organized group