American spelling vs colorful

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

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

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

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