cherry red vs redness

cherry red and redness both are nouns.

Word	Noun	Adjective	Verb	Adverb
cherry red	Yes	No	No	No
redness	Yes	No	No	No

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

cherry red: a red the color of ripe cherries
redness: red color or pigment; the chromatic color resembling the hue of blood

Other hypernyms of cherry red include red.

cherry red (noun)	redness (noun)
a red the color of ripe cherries	red color or pigment; the chromatic color resembling the hue of blood
	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat