protrude vs bulge out

protrude and bulge out both are verbs.

Word	Noun	Adjective	Verb	Adverb
protrude	No	No	Yes	No
bulge out	No	No	Yes	No

As verbs, protrude and bulge out are synonyms defined as:

Other synonyms of protrude include bug out, bulge, come out, pop, pop out, start.

protrude (verb)	bulge out (verb)
swell or protrude outwards	bulge outward
bulge outward
extend out or project in space