Yes, PHYSICAL is a Scrabble word!

Letter values in Scrabble US: P 3, H 4, Y 4, S 1, I 1, C 3, A 1, L 1.

Is it a valid word?

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

involving the body as distinguished from the mind or spirit
relating to the sciences dealing with matter and energy; especially physics
having substance or material existence; perceptible to the senses
according with material things or natural laws (other than those peculiar to living matter)
characterized by energetic bodily activity
impelled by physical force especially against resistance
concerned with material things

Also: strong-arm.