oedema vs edema

oedema and edema both are nouns.

Word	Noun	Adjective	Verb	Adverb
oedema	Yes	No	No	No
edema	Yes	No	No	No

As nouns, oedema and edema are synonyms defined as:

oedema and edema: swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities

Other synonyms of oedema include dropsy, hydrops.

oedema (noun)	edema (noun)
swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities	swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities