radiculitis vs redness

radiculitis and redness both are nouns.

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

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

radiculitis: inflammation of the radicle of a nerve
redness: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of radiculitis include inflammation, rubor.

radiculitis (noun)	redness (noun)
inflammation of the radicle of a nerve	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