crew member vs trained worker

crew member and trained worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
crew member	Yes	No	No	No
trained worker	Yes	No	No	No

As nouns, trained worker is a hypernym of crew member; that is, trained worker is a word with a broader meaning than crew member:

Other hypernyms of crew member include skilled worker, skilled workman.

crew member (noun)	trained worker (noun)
a member of a flight crew	a worker who has acquired special skills