protrusion vs swelling

protrusion and swelling both are nouns.

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

As nouns, protrusion and swelling are synonyms defined as:

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

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

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