colourful vs red

colourful is not a noun while red is a noun.

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

colourful (noun)	red (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

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