plural vs ironworks

plural and ironworks both are nouns.

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

plural (noun)	ironworks (noun)
the form of a word that is used to denote more than one	the workplace where iron is smelted or where iron goods are made

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