lineman vs American football game

lineman and American football game both are nouns.

Word	Noun	Adjective	Verb	Adverb
lineman	Yes	No	No	No
American football game	Yes	No	No	No

lineman (noun)	American football game (noun)
(American football) the position of a player on a football team who is stationed on the line of scrimmage	a game played by two teams of 11 players on a rectangular field 100 yards long; teams try to get possession of the ball and advance it across the opponents goal line in a series of (running or passing) plays
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