colorful vs tricolor

colorful is not a noun while tricolor is a noun.

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

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

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