avulsion vs avulse

avulsion is a noun but avulse is not a noun.

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

avulsion (noun)	avulse (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

avulsion (verb)	avulse (verb)
	separate by avulsion