carditis vs rubor

carditis and rubor both are nouns.

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

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

carditis: inflammation of the heart
rubor: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of carditis include inflammation, redness.

carditis (noun)	rubor (noun)
inflammation of the heart	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat