colouring vs coloring

colouring and coloring both are nouns.

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

As nouns, colouring and coloring are synonyms defined as:

colouring and coloring: the act or process of changing the color of something

As nouns, colouring and coloring are synonyms defined as:

colouring and coloring: a visual attribute of things that results from the light they emit or transmit or reflect

Other synonyms of colouring include color, colour.

As nouns, colouring and coloring are synonyms defined as:

colouring and coloring: a digestible substance used to give color to food

Other synonyms of colouring include food color, food coloring, food colour, food colouring.

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