linemen vs lineman

linemen and lineman both are nouns.

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

linemen (noun)	lineman (noun)
the football players who line up on the line of scrimmage	(American football) the position of a player on a football team who is stationed on the line of scrimmage
	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