swelling vs lump

swelling and lump both are nouns.

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

As nouns, swelling and lump are synonyms defined as:

Other synonyms of swelling include puffiness.

swelling (noun)	lump (noun)
the increase in volume of certain substances when they are heated (often accompanied by release of water)	a compact mass
something that bulges out or is protuberant or projects from its surroundings	a large piece of something without definite shape
an abnormal protuberance or localized enlargement	an awkward stupid person
	an abnormal protuberance or localized enlargement

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