esophagoscope vs oesophagoscope

esophagoscope and oesophagoscope both are nouns.

Word	Noun	Adjective	Verb	Adverb
esophagoscope	Yes	No	No	No
oesophagoscope	Yes	No	No	No

As nouns, esophagoscope and oesophagoscope are synonyms defined as:

esophagoscope and oesophagoscope: an optical instrument for examining the inside of the esophagus

esophagoscope (noun)	oesophagoscope (noun)
an optical instrument for examining the inside of the esophagus	an optical instrument for examining the inside of the esophagus