swelling vs gibbousness

swelling and gibbousness both are nouns.

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

As nouns, swelling and gibbousness are synonyms defined as:

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

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

swelling (noun)	gibbousness (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