debouch vs egress

debouch is not a noun while egress is a noun.

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

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

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

debouch (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

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