protuberance vs swelling

protuberance and swelling both are nouns.

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

As nouns, protuberance and swelling are synonyms defined as:

protuberance and swelling: something that bulges out or is protuberant or projects from its surroundings

Other synonyms of protuberance include bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion.

protuberance (noun)	swelling (noun)
something that bulges out or is protuberant or projects from its surroundings	the increase in volume of certain substances when they are heated (often accompanied by release of water)
the condition of being protuberant; the condition of bulging out	something that bulges out or is protuberant or projects from its surroundings
	an abnormal protuberance or localized enlargement