one-sided vs coloured

one-sided is not a noun while coloured is a noun.

Word	Noun	Adjective	Verb	Adverb
one-sided	No	Yes	No	No
coloured	Yes	Yes	No	No

As adjectives, one-sided and coloured are synonyms defined as:

Other synonyms of one-sided include biased, colored, slanted.

one-sided (noun)	coloured (noun)
	a United States term for Blacks that is now considered offensive

one-sided (adjective)	coloured (adjective)
not reversible or capable of having either side out	having color or a certain color; sometimes used in combination
involving only one part or side	(used of color) artificially produced; not natural
favoring one person or side over another	having skin rich in melanin pigments;
	favoring one person or side over another