swelling vs gibbosity

swelling and gibbosity both are nouns.

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

As nouns, swelling and gibbosity are synonyms defined as:

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

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

swelling (noun)	gibbosity (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
an abnormal protuberance or localized enlargement