polychromatic vs colourful

polychromatic and colourful both are adjectives.

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

polychromatic (adjective)	colourful (adjective)
(of light or other electromagnetic radiation) composed of more than one wavelength	having much or varied color
having or exhibiting many colors	striking in variety and interest
	having color or a certain color; sometimes used in combination