redness vs rubor

redness and rubor both are nouns.

Word	Noun	Adjective	Verb	Adverb
redness	Yes	No	No	No
rubor	Yes	No	No	No

As nouns, redness and rubor are synonyms defined as:

redness and rubor: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other synonyms of redness include inflammation.

redness (noun)	rubor (noun)
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
a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat