wireman vs skilled worker

wireman and skilled worker both are nouns.

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

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

Other hypernyms of wireman include skilled workman, trained worker.

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