Yes, DRIVER is a Scrabble word!

Letter values in Scrabble US: D 2, R 1, I 1, V 4, E 1, R 1.

Is it a valid word?

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

the operator of a motor vehicle
someone who drives animals that pull a vehicle
a golfer who hits the golf ball with a driver
(computer science) a program that determines how a computer will communicate with a peripheral device
a golf club (a wood) with a near vertical face that is used for hitting long shots from the tee

Also: device driver, number one wood.