arteritis vs redness

arteritis and redness both are nouns.

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

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

arteritis: inflammation of an artery
redness: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of arteritis include inflammation, rubor.

arteritis (noun)	redness (noun)
inflammation of an artery	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