Yes, PAWNEES is a Scrabble word!

Letter values in Scrabble US: P 3, A 1, W 4, N 1, E 1, E 1, S 1.

Is it a valid word?

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

a member of the Pawnee nation formerly living in Nebraska and Kansas but now largely in Oklahoma
the Caddoan language spoken by the Pawnee