coloring vs colouring

coloring and colouring both are nouns.

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

As nouns, coloring and colouring are synonyms defined as:

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

As nouns, coloring and colouring are synonyms defined as:

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

Other synonyms of coloring include color, colour.

As nouns, coloring and colouring are synonyms defined as:

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

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

coloring (noun)	colouring (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