slacks vs plural

slacks and plural both are nouns.

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

slacks (noun)	plural (noun)
(used in the plural) pants for casual wear	the form of a word that is used to denote more than one

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