colouring vs colorful

colouring is a noun but colorful is not a noun.

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

colouring (noun)	colorful (noun)
the act or process of changing the color of something
a visual attribute of things that results from the light they emit or transmit or reflect
a digestible substance used to give color to food

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