colouring vs colored

colouring and colored both are nouns.

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

colouring (noun)	colored (noun)
the act or process of changing the color of something	a United States term for Blacks that is now considered offensive
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)	colored (adjective)
	having color or a certain color; sometimes used in combination
	(used of color) artificially produced; not natural
	having skin rich in melanin pigments;
	favoring one person or side over another