Yes, SPITTERS is a Scrabble word!

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

Is it a valid word?

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

a person who spits (ejects saliva or phlegm from the mouth)
an illegal pitch in which a foreign substance (spit or Vaseline) is applied to the ball by the pitcher before he throws it

Not playable in Scrabble US: EXPECTORATOR.