colorful vs vividness

colorful is not a noun while vividness is a noun.

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

colorful (noun)	vividness (noun)
	chromatic purity: freedom from dilution with white and hence vivid in hue
	interest and variety and intensity

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