red vs chromatic colour

red and chromatic colour both are nouns.

Word	Noun	Adjective	Verb	Adverb
red	Yes	Yes	No	No
chromatic colour	Yes	No	No	No

As nouns, chromatic colour is a hypernym of red; that is, chromatic colour is a word with a broader meaning than red:

Other hypernyms of red include chromatic color, spectral color, spectral colour.

red (noun)	chromatic colour (noun)
red color or pigment; the chromatic color resembling the hue of blood	a color that has hue
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)	chromatic colour (adjective)
(especially of the face) reddened or suffused with or as if with blood from emotion or exertion
of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies
characterized by violence or bloodshed