Yes, FENDERS is a Scrabble word!

Letter values in Scrabble US: F 4, E 1, N 1, D 2, E 1, R 1, S 1.

Is it a valid word?

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

a barrier that surrounds the wheels of a vehicle to block splashing water or mud
an inclined metal frame at the front of a locomotive to clear the track
a low metal guard to confine falling coals to a hearth
a cushion-like device that reduces shock due to an impact