oesophagitis vs rubor

oesophagitis and rubor both are nouns.

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

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

oesophagitis: inflammation of the esophagus; often caused by gastroesophageal reflux
rubor: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of oesophagitis include inflammation, redness.

oesophagitis (noun)	rubor (noun)
inflammation of the esophagus; often caused by gastroesophageal reflux	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat