avulse vs avulsion

avulse is not a noun while avulsion is a noun.

Word	Noun	Adjective	Verb	Adverb
avulse	No	No	Yes	No
avulsion	Yes	No	No	No

avulse (noun)	avulsion (noun)
	a forcible tearing or surgical separation of one body part from another
	an abrupt change in the course of a stream that forms the boundary between two parcels of land resulting in the loss of part of the land of one landowner and a consequent increase in the land of another

avulse (verb)	avulsion (verb)
separate by avulsion