lineman vs trained worker

lineman and trained worker both are nouns.

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

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

Other hypernyms of lineman include skilled worker, skilled workman.

lineman (noun)	trained worker (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