egress vs debouch

egress is a noun but debouch is not a noun.

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

As verbs, debouch is a hyponym of egress; that is, debouch is a word with a more specific, narrower meaning than egress:

Other hyponyms of egress include pop out, radiate, leak, escape, fall, come out, fall out.

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

egress (verb)	debouch (verb)
come out of	pass out or emerge; especially of rivers
	march out (as from a defile) into open ground