redness vs orange red

redness and orange red both are nouns.

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

As nouns, orange red is a hyponym of redness; that is, orange red is a word with a more specific, narrower meaning than redness:

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

redness (noun)	orange red (noun)
red color or pigment; the chromatic color resembling the hue of blood	a variable color that is vivid red but sometimes with an orange tinge
a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat