Yes, SPILLERS is a Scrabble word!

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

Is it a valid word?

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

an attacker who sheds or spills blood
a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys)

Also: trawl line.