scleritis vs rubor

scleritis and rubor both are nouns.

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

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

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

Other hypernyms of scleritis include inflammation, redness.

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