roan vs coloured

roan and coloured both are nouns.

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

roan (noun)	coloured (noun)
a horse having a brownish coat thickly sprinkled with white or gray	a United States term for Blacks that is now considered offensive
a soft sheepskin leather that is colored and finished to resemble morocco; used in bookbinding

roan (adjective)	coloured (adjective)
(used of especially horses) having a brownish coat thickly sprinkled with white or grey	having color or a certain color; sometimes used in combination
	(used of color) artificially produced; not natural
	having skin rich in melanin pigments;
	favoring one person or side over another