gibbosity vs gibbousness

gibbosity and gibbousness both are nouns.

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

As nouns, gibbosity and gibbousness are synonyms defined as:

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

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

gibbosity (noun)	gibbousness (noun)
something that bulges out or is protuberant or projects from its surroundings	something that bulges out or is protuberant or projects from its surroundings