entering vs incursion

entering and incursion both are nouns.

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

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

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

entering (noun)	incursion (noun)
the act of entering	an attack that penetrates into enemy territory
a movement into or inward	the act of entering some territory or domain (often in large numbers)
	the mistake of incurring liability or blame