plural vs widow's weeds

plural and widow's weeds both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural	Yes	Yes	No	No
widow's weeds	Yes	No	No	No

plural (noun)	widow's weeds (noun)
the form of a word that is used to denote more than one	a black garment (dress) worn by a widow as a sign of mourning

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