colours vs plural

colours and plural both are nouns.

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

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

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