oedema vs hydrops

oedema and hydrops both are nouns.

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

As nouns, oedema and hydrops are synonyms defined as:

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

Other synonyms of oedema include dropsy, edema.

oedema (noun)	hydrops (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