crewman vs trained worker

crewman and trained worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
crewman	Yes	No	No	No
trained worker	Yes	No	No	No

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

Other hypernyms of crewman include skilled worker, skilled workman.

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

Other hypernyms of crewman include skilled worker, skilled workman.

crewman (noun)	trained worker (noun)
a member of a work crew	a worker who has acquired special skills
a member of a flight crew
any member of a ship's crew