polychromatic vs coloured

polychromatic is not a noun while coloured is a noun.

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

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

polychromatic (adjective)	coloured (adjective)
(of light or other electromagnetic radiation) composed of more than one wavelength	having color or a certain color; sometimes used in combination
having or exhibiting many colors	(used of color) artificially produced; not natural
	having skin rich in melanin pigments;
	favoring one person or side over another