protrude vs pop out

protrude and pop out both are verbs.

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

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

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

protrude (verb)	pop out (verb)
swell or protrude outwards	come out suddenly or forcefully
bulge outward	exit briefly
extend out or project in space	bulge outward
	appear suddenly or unexpectedly; happen unexpectedly