iritis vs rubor

iritis and rubor both are nouns.

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

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

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

Other hypernyms of iritis include inflammation, redness.

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