appendicitis vs redness

appendicitis and redness both are nouns.

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

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

appendicitis: inflammation of the vermiform appendix
redness: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of appendicitis include inflammation, rubor.

appendicitis (noun)	redness (noun)
inflammation of the vermiform appendix	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