shadowbox vs athletics

shadowbox is not a noun while athletics is a noun.

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

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

shadowbox (verb)	athletics (verb)
go through boxing motions without an opponent