Yes, SPINNERS is a Scrabble word!

Letter values in Scrabble US: S 1, P 3, I 1, N 1, N 1, E 1, R 1, S 1.

Is it a valid word?

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

someone who spins (who twists fibers into threads)
board game equipment that consists of a dial and an arrow that is spun to determine the next move in the game
fisherman's lure; revolves when drawn through the water

Also: thread maker.