valvulitis vs rubor

valvulitis and rubor both are nouns.

Word	Noun	Adjective	Verb	Adverb
valvulitis	Yes	No	No	No
rubor	Yes	No	No	No

As nouns, rubor is a hypernym of valvulitis; that is, rubor is a word with a broader meaning than valvulitis:

valvulitis: inflammation of a valve (especially of a cardiac valve as a consequence of rheumatic fever)
rubor: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of valvulitis include inflammation, redness.

valvulitis (noun)	rubor (noun)
inflammation of a valve (especially of a cardiac valve as a consequence of rheumatic fever)	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat