oesophagitis vs esophagitis

oesophagitis and esophagitis both are nouns.

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

As nouns, oesophagitis and esophagitis are synonyms defined as:

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

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