swelling vs protuberance

swelling and protuberance both are nouns.

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

As nouns, swelling and protuberance are synonyms defined as:

swelling and protuberance: 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, protrusion.

swelling (noun)	protuberance (noun)
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	the condition of being protuberant; the condition of bulging out
an abnormal protuberance or localized enlargement