edema vs oedema

edema and oedema both are nouns.

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

As nouns, edema and oedema are synonyms defined as:

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

Other synonyms of edema include dropsy, hydrops.

edema (noun)	oedema (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