coloured vs biased

coloured is a noun but biased is not a noun.

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

As adjectives, coloured and biased are synonyms defined as:

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

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

coloured (adjective)	biased (adjective)
having color or a certain color; sometimes used in combination	favoring one person or side over another
(used of color) artificially produced; not natural
having skin rich in melanin pigments;
favoring one person or side over another