flats vs plural

flats and plural both are nouns.

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

flats (noun)	plural (noun)
footwear (shoes or slippers) with no heel (or a very low heel)	the form of a word that is used to denote more than one

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