hydrops vs oedema

hydrops and oedema both are nouns.

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

As nouns, hydrops and oedema are synonyms defined as:

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

Other synonyms of hydrops include dropsy, edema.

hydrops (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