chromatic vs coloured

chromatic is not a noun while coloured is a noun.

Word	Noun	Adjective	Verb	Adverb
chromatic	No	Yes	No	No
coloured	Yes	Yes	No	No

chromatic (noun)	coloured (noun)
	a United States term for Blacks that is now considered offensive

chromatic (adjective)	coloured (adjective)
being or having or characterized by hue	having color or a certain color; sometimes used in combination
based on a scale consisting of 12 semitones	(used of color) artificially produced; not natural
able to refract light without spectral color separation	having skin rich in melanin pigments;
	favoring one person or side over another