athletics vs offsides

athletics is a noun but offsides is not a noun.

Word	Noun	Adjective	Verb	Adverb
athletics	Yes	No	No	No
offsides	No	Yes	No	No

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

athletics (adjective)	offsides (adjective)
	illegally beyond a prescribed line or area or ahead of the ball or puck