colourful vs tricolor

colourful is not a noun while tricolor is a noun.

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

colourful (noun)	tricolor (noun)
	a flag having three colored stripes (especially the French flag)

colourful (adjective)	tricolor (adjective)
having much or varied color	having or involving three colors
striking in variety and interest
having color or a certain color; sometimes used in combination