briefs vs plural

briefs and plural both are nouns.

Word	Noun	Adjective	Verb	Adverb
briefs	Yes	No	No	No
plural	Yes	Yes	No	No

briefs (noun)	plural (noun)
(used in the plural) short tight-fitting underpants (trade name Jockey shorts)	the form of a word that is used to denote more than one

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