emission vs egress

emission and egress both are nouns.

Word	Noun	Adjective	Verb	Adverb
emission	Yes	No	No	No
egress	Yes	No	Yes	No

As nouns, egress is a hypernym of emission; that is, egress is a word with a broader meaning than emission:

Other hypernyms of emission include egression, emergence.

emission (noun)	egress (noun)
the act of emitting; causing to flow forth	the act of coming (or going) out; becoming apparent
the occurrence of a flow of water (as from a pipe)	(astronomy) the reappearance of a celestial body after an eclipse
the release of electrons from parent atoms	the becoming visible
any of several bodily processes by which substances go out of the body
a substance that is emitted or released

emission (verb)	egress (verb)
	come out of