angiitis vs redness

angiitis and redness both are nouns.

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

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

angiitis: inflammation of a blood vessel or lymph duct
redness: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of angiitis include angiopathy, inflammation, rubor.

angiitis (noun)	redness (noun)
inflammation of a blood vessel or lymph duct	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