crewman vs skilled workman

crewman and skilled workman both are nouns.

Word	Noun	Adjective	Verb	Adverb
crewman	Yes	No	No	No
skilled workman	Yes	No	No	No

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

Other hypernyms of crewman include skilled worker, trained worker.

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

Other hypernyms of crewman include skilled worker, trained worker.

crewman (noun)	skilled workman (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