plural vs close quarters

plural and close quarters both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural	Yes	Yes	No	No
close quarters	Yes	No	No	No

plural (noun)	close quarters (noun)
the form of a word that is used to denote more than one	a situation of being uncomfortably close to someone or something

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