swelling vs protrusion

swelling and protrusion both are nouns.

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

As nouns, swelling and protrusion are synonyms defined as:

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

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

swelling (noun)	protrusion (noun)
the increase in volume of certain substances when they are heated (often accompanied by release of water)	the act of projecting out from something
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