orange red vs redness

orange red and redness both are nouns.

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

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

orange red: a variable color that is vivid red but sometimes with an orange tinge
redness: red color or pigment; the chromatic color resembling the hue of blood

Other hypernyms of orange red include red.

orange red (noun)	redness (noun)
a variable color that is vivid red but sometimes with an orange tinge	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