gaffer vs lineman

gaffer and lineman both are nouns.

Word	Noun	Adjective	Verb	Adverb
gaffer	Yes	No	No	No
lineman	Yes	No	No	No

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

Other hypernyms of gaffer include electrician, linesman.

gaffer (noun)	lineman (noun)
a person who exercises control over workers	(American football) the position of a player on a football team who is stationed on the line of scrimmage
an elderly man	one of the players on the line of scrimmage
an electrician responsible for lighting on a movie or tv set	a person who installs or repairs electrical or telephone lines
	the surveyor who marks positions with a range pole