plural vs bellbottom trousers

plural and bellbottom trousers both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural	Yes	Yes	No	No
bellbottom trousers	Yes	No	No	No

plural (noun)	bellbottom trousers (noun)
the form of a word that is used to denote more than one	(used in the plural) trousers with legs that flare; worn by sailors; absurdly wide hems were fashionable in the 1960s

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