athletics vs warm the bench

athletics is a noun but warm the bench is not a noun.

Word	Noun	Adjective	Verb	Adverb
athletics	Yes	No	No	No
warm the bench	No	No	Yes	No

athletics (noun)	warm the bench (noun)
an active diversion requiring physical exertion and competition
participation in sports events as an extracurricular activity
a contest between athletes

athletics (verb)	warm the bench (verb)
	be out of the game