incur vs incursion

incur is not a noun while incursion is a noun.

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

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

incur (verb)	incursion (verb)
receive a specified treatment (abstract)
make oneself subject to; bring upon oneself; become liable to