sweat pants vs plural

sweat pants and plural both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweat pants	Yes	No	No	No
plural	Yes	Yes	No	No

sweat pants (noun)	plural (noun)
loose-fitting trousers with elastic cuffs; worn by athletes	the form of a word that is used to denote more than one

sweat pants (adjective)	plural (adjective)
	grammatical number category referring to two or more items or units
	composed of more than one member, set, or kind