linesman vs trained worker

linesman and trained worker both are nouns.

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

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

Other hypernyms of linesman include skilled worker, skilled workman.

linesman (noun)	trained worker (noun)
a person who installs or repairs electrical or telephone lines	a worker who has acquired special skills
official (in tennis, soccer, football, etc.) who assists the referee in some way (especially by watching for out of bounds or offside)