tendinitis vs rubor

tendinitis and rubor both are nouns.

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

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

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

Other hypernyms of tendinitis include inflammation, redness.

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