rhinitis vs rubor

rhinitis and rubor both are nouns.

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

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

rhinitis: an inflammation of the mucous membrane lining the nose (usually associated with nasal discharge)
rubor: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of rhinitis include inflammation, redness.

rhinitis (noun)	rubor (noun)
an inflammation of the mucous membrane lining the nose (usually associated with nasal discharge)	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat