plural vs dress whites

plural and dress whites both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural	Yes	Yes	No	No
dress whites	Yes	No	No	No

plural (noun)	dress whites (noun)
the form of a word that is used to denote more than one	a dress uniform for formal occasions

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