Yes, AVULSION is a Scrabble word!

Letter values in Scrabble US: A 1, V 4, U 1, L 1, S 1, I 1, O 1, N 1.

Is it a valid word?

AVULSION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

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
a forcible tearing or surgical separation of one body part from another