dropsy vs oedema

dropsy and oedema both are nouns.

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

As nouns, dropsy and oedema are synonyms defined as:

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

Other synonyms of dropsy include edema, hydrops.

dropsy (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