red vs colourful

red is a noun but colourful is not a noun.

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

red (noun)	colourful (noun)
red color or pigment; the chromatic color resembling the hue of blood
emotionally charged terms used to refer to extreme radicals or revolutionaries
the amount by which the cost of a business exceeds its revenue

red (adjective)	colourful (adjective)
(especially of the face) reddened or suffused with or as if with blood from emotion or exertion	having much or varied color
of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies	striking in variety and interest
characterized by violence or bloodshed	having color or a certain color; sometimes used in combination