indigo vs coloured

indigo and coloured both are nouns.

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

indigo (noun)	coloured (noun)
a blue-violet color	a United States term for Blacks that is now considered offensive
deciduous subshrub of southeastern Asia having pinnate leaves and clusters of red or purple flowers; a source of indigo dye
a blue dye obtained from plants or made synthetically

indigo (adjective)	coloured (adjective)
having a color between blue and violet	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