beginning vs egress

beginning and egress both are nouns.

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

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

beginning (noun)	egress (noun)
the act of starting something	the act of coming (or going) out; becoming apparent
the first part or section of something	(astronomy) the reappearance of a celestial body after an eclipse
the event consisting of the start of something	the becoming visible
the place where something begins, where it springs into being
the time at which something is supposed to begin

beginning (adjective)	egress (adjective)
serving to begin

beginning (verb)	egress (verb)
	come out of