colorful vs polychrome

colorful is not a noun while polychrome is a noun.

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

colorful (noun)	polychrome (noun)
	a piece of work composed of or decorated in many colors

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

colorful (verb)	polychrome (verb)
	color with many colors; make polychrome