protuberance vs gibbousness

protuberance and gibbousness both are nouns.

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

As nouns, protuberance and gibbousness are synonyms defined as:

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

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

protuberance (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
the condition of being protuberant; the condition of bulging out