plural vs waterworks

plural and waterworks both are nouns.

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

plural (noun)	waterworks (noun)
the form of a word that is used to denote more than one	workplace where water is stored and purified and distributed for a community
	a public utility that provides water

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