dithered color vs colouring

dithered color and colouring both are nouns.

Word	Noun	Adjective	Verb	Adverb
dithered color	Yes	No	No	No
colouring	Yes	No	No	No

As nouns, colouring is a hypernym of dithered color; that is, colouring is a word with a broader meaning than dithered color:

dithered color: a color produced by a pattern of differently colored dots that together simulate the desired color
colouring: a visual attribute of things that results from the light they emit or transmit or reflect

Other hypernyms of dithered color include color, coloring, colour.

dithered color (noun)	colouring (noun)
a color produced by a pattern of differently colored dots that together simulate the desired color	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