colorful vs coloured

colorful is not a noun while coloured is a noun.

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

As adjectives, colorful and coloured are synonyms defined as:

colorful and coloured: having color or a certain color; sometimes used in combination

Other synonyms of colorful include colored, colourful.

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

colorful (adjective)	coloured (adjective)
having much or varied color	having color or a certain color; sometimes used in combination
having color or a certain color; sometimes used in combination	(used of color) artificially produced; not natural
striking in variety and interest	having skin rich in melanin pigments;
	favoring one person or side over another