lineman vs skilled workman

lineman and skilled workman both are nouns.

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

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

Other hypernyms of lineman include skilled worker, trained worker.

lineman (noun)	skilled workman (noun)
(American football) the position of a player on a football team who is stationed on the line of scrimmage	a worker who has acquired special skills
one of the players on the line of scrimmage
a person who installs or repairs electrical or telephone lines
the surveyor who marks positions with a range pole