esophagitis vs oesophagitis

esophagitis and oesophagitis both are nouns.

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

As nouns, esophagitis and oesophagitis are synonyms defined as:

esophagitis and oesophagitis: inflammation of the esophagus; often caused by gastroesophageal reflux

esophagitis (noun)	oesophagitis (noun)
inflammation of the esophagus; often caused by gastroesophageal reflux	inflammation of the esophagus; often caused by gastroesophageal reflux