gibbousness vs protuberance

gibbousness and protuberance both are nouns.

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

As nouns, gibbousness and protuberance are synonyms defined as:

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

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

gibbousness (noun)	protuberance (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
	the condition of being protuberant; the condition of bulging out