plural vs colours

plural and colours both are nouns.

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

plural (noun)	colours (noun)
the form of a word that is used to denote more than one	a flag that shows its nationality
	a distinguishing emblem

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