colourful vs roan

colourful is not a noun while roan is a noun.

Word	Noun	Adjective	Verb	Adverb
colourful	No	Yes	No	No
roan	Yes	Yes	No	No

colourful (noun)	roan (noun)
	a horse having a brownish coat thickly sprinkled with white or gray
	a soft sheepskin leather that is colored and finished to resemble morocco; used in bookbinding

colourful (adjective)	roan (adjective)
having much or varied color	(used of especially horses) having a brownish coat thickly sprinkled with white or grey
striking in variety and interest
having color or a certain color; sometimes used in combination