Yes, STEEPLE is a Scrabble word!

Letter values in Scrabble US: S 1, T 1, E 1, E 1, P 3, L 1, E 1.

Is it a valid word?

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

a tall tower that forms the superstructure of a building (usually a church or temple) and that tapers to a point at the top