lump vs edema

lump and edema both are nouns.

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

As nouns, edema is a hyponym of lump; that is, edema is a word with a more specific, narrower meaning than lump:

lump: an abnormal protuberance or localized enlargement
edema: swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities

lump (noun)	edema (noun)
a compact mass	swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities
a large piece of something without definite shape
an awkward stupid person
an abnormal protuberance or localized enlargement

lump (verb)	edema (verb)
group or chunk together in a certain order or place side by side
put together indiscriminately