esophagitis vs redness

esophagitis and redness both are nouns.

Word	Noun	Adjective	Verb	Adverb
esophagitis	Yes	No	No	No
redness	Yes	No	No	No

As nouns, redness is a hypernym of esophagitis; that is, redness is a word with a broader meaning than esophagitis:

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

Other hypernyms of esophagitis include inflammation, rubor.

esophagitis (noun)	redness (noun)
inflammation of the esophagus; often caused by gastroesophageal reflux	red color or pigment; the chromatic color resembling the hue of blood
	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat