stretch pants vs plural

stretch pants and plural both are nouns.

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

stretch pants (noun)	plural (noun)
trousers made of a stretchy fabric	the form of a word that is used to denote more than one

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