colorful vs American spelling

colorful is not a noun while American spelling is a noun.

Word	Noun	Adjective	Verb	Adverb
colorful	No	Yes	No	No
American spelling	Yes	No	No	No

colorful (noun)	American spelling (noun)
	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

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