coloration vs colour

coloration and colour both are nouns.

Word	Noun	Adjective	Verb	Adverb
coloration	Yes	No	No	No
colour	Yes	Yes	Yes	No

As nouns, colour is a hypernym of coloration; that is, colour is a word with a broader meaning than coloration:

coloration: appearance with regard to color
colour: a visual attribute of things that results from the light they emit or transmit or reflect

Other hypernyms of coloration include color, coloring, colouring.

As nouns, coloration and colour are synonyms defined as:

Other synonyms of coloration include color, colouration.

coloration (noun)	colour (noun)
choice and use of colors (as by an artist)	a visual attribute of things that results from the light they emit or transmit or reflect
appearance with regard to color	the appearance of objects (or light sources) described in terms of a person's perception of their hue and lightness (or brightness) and saturation
the timbre of a musical sound	the timbre of a musical sound
	interest and variety and intensity
	an outward or token appearance or form that is deliberately misleading
	(physics) the characteristic of quarks that determines their role in the strong interaction
	any material used for its color

coloration (adjective)	colour (adjective)
	having or capable of producing colors

coloration (verb)	colour (verb)
	change color, often in an undesired manner
	add color to
	affect as in thought or feeling
	give a deceptive explanation or excuse for
	decorate with colors
	modify or bias