colouring material vs coloring material

colouring material and coloring material both are nouns.

Word	Noun	Adjective	Verb	Adverb
colouring material	Yes	No	No	No
coloring material	Yes	No	No	No

As nouns, colouring material and coloring material are synonyms defined as:

colouring material and coloring material: any material used for its color

Other synonyms of colouring material include color, colour.

colouring material (noun)	coloring material (noun)
any material used for its color	any material used for its color