colourful vs gaudy

colourful is not a noun while gaudy is a noun.

Word	Noun	Adjective	Verb	Adverb
colourful	No	Yes	No	No
gaudy	Yes	Yes	No	No

colourful (noun)	gaudy (noun)
	(Britain) a celebratory reunion feast or entertainment held at a college

colourful (adjective)	gaudy (adjective)
having much or varied color	(used especially of clothes) marked by conspicuous display
striking in variety and interest	tastelessly showy
having color or a certain color; sometimes used in combination