ingress vs incursion

ingress and incursion both are nouns.

Word	Noun	Adjective	Verb	Adverb
ingress	Yes	No	No	No
incursion	Yes	No	No	No

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

ingress: the act of entering
incursion: the act of entering some territory or domain (often in large numbers)

ingress (noun)	incursion (noun)
the act of entering	an attack that penetrates into enemy territory
(astronomy) the disappearance of a celestial body prior to an eclipse	the act of entering some territory or domain (often in large numbers)
	the mistake of incurring liability or blame