parotitis vs redness

parotitis and redness both are nouns.

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

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

parotitis: inflammation of one or both parotid glands
redness: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of parotitis include inflammation, rubor.

parotitis (noun)	redness (noun)
inflammation of one or both parotid glands	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