athletics vs double-team

athletics is a noun but double-team is not a noun.

Word	Noun	Adjective	Verb	Adverb
athletics	Yes	No	No	No
double-team	No	No	Yes	No

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

athletics (verb)	double-team (verb)
	cover with two defensive players