colored vs colourful

colored is a noun but colourful is not a noun.

Word	Noun	Adjective	Verb	Adverb
colored	Yes	Yes	No	No
colourful	No	Yes	No	No

As adjectives, colored and colourful are synonyms defined as:

colored and colourful: having color or a certain color; sometimes used in combination

Other synonyms of colored include colorful, coloured.

colored (noun)	colourful (noun)
a United States term for Blacks that is now considered offensive

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