oil colour vs oil color

oil colour and oil color both are nouns.

Word	Noun	Adjective	Verb	Adverb
oil colour	Yes	No	No	No
oil color	Yes	No	No	No

As nouns, oil colour and oil color are synonyms defined as:

oil colour and oil color: oil paint containing pigment that is used by an artist

Other synonyms of oil colour include oil.

oil colour (noun)	oil color (noun)
oil paint containing pigment that is used by an artist	oil paint containing pigment that is used by an artist