protuberance vs protrusion

protuberance and protrusion both are nouns.

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

As nouns, protuberance and protrusion are synonyms defined as:

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

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

protuberance (noun)	protrusion (noun)
something that bulges out or is protuberant or projects from its surroundings	the act of projecting out from something
the condition of being protuberant; the condition of bulging out	something that bulges out or is protuberant or projects from its surroundings