athletics vs underhanded

athletics is a noun but underhanded is not a noun.

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

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

athletics (adjective)	underhanded (adjective)
	with hand brought forward and up from below shoulder level
	marked by deception