protuberance vs bulge

protuberance and bulge both are nouns.

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

As nouns, protuberance and bulge are synonyms defined as:

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

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

protuberance (noun)	bulge (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

protuberance (verb)	bulge (verb)
	swell or protrude outwards
	cause to bulge or swell outwards
	bulge outward
	bulge out; form a bulge outward, or be so full as to appear to bulge