pop out vs pop up

pop out and pop up both are verbs.

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

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

pop out and pop up: appear suddenly or unexpectedly; happen unexpectedly

Other synonyms of pop out include burst out, crop up, pop.

pop out (verb)	pop up (verb)
come out suddenly or forcefully	appear suddenly or unexpectedly; happen unexpectedly
exit briefly
bulge outward
appear suddenly or unexpectedly; happen unexpectedly