Yes, ABSEILS is a Scrabble word!

Letter values in Scrabble US: A 1, B 3, S 1, E 1, I 1, L 1, S 1.

Is it a valid word?

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

(mountaineering) a descent of a vertical cliff or wall made by using a doubled rope that is fixed to a higher point and wrapped around the body

Also: rope down.