athletics vs at home

athletics and at home both are nouns.

Word	Noun	Adjective	Verb	Adverb
athletics	Yes	No	No	No
at home	Yes	No	No	Yes

athletics (noun)	at home (noun)
an active diversion requiring physical exertion and competition	a reception held in your own home
participation in sports events as an extracurricular activity
a contest between athletes

athletics (adverb)	at home (adverb)
	at, to, or toward the place where you reside
	on the home team's field