pop out vs egress

pop out is not a noun while egress is a noun.

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

As verbs, egress is a hypernym of pop out; that is, egress is a word with a broader meaning than pop out:

Other hypernyms of pop out include come forth, come out, emerge, go forth, issue.

pop out (noun)	egress (noun)
	the act of coming (or going) out; becoming apparent
	(astronomy) the reappearance of a celestial body after an eclipse
	the becoming visible

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