exit vs pop out

exit is a noun but pop out is not a noun.

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

As verbs, pop out is a hyponym of exit; that is, pop out is a word with a more specific, narrower meaning than exit:

exit (noun)	pop out (noun)
the act of going out
an opening that permits escape or release
euphemistic expressions for death

exit (verb)	pop out (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	come out suddenly or forcefully
lose the lead	exit briefly
move out of or depart from	bulge outward
	appear suddenly or unexpectedly; happen unexpectedly