wireman vs trained worker

wireman and trained worker both are nouns.

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

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

Other hypernyms of wireman include skilled worker, skilled workman.

wireman (noun)	trained worker (noun)
a worker who installs and repairs electric wiring	a worker who has acquired special skills