ironworks vs plural

ironworks and plural both are nouns.

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

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

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