Yes, BUTLERS is a Scrabble word!

Letter values in Scrabble US: B 3, U 1, T 1, L 1, E 1, R 1, S 1.

Is it a valid word?

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

a manservant (usually the head servant of a household) who has charge of wines and the table
English novelist who described a fictitious land he called Erewhon (1835-1902)
English poet (1612-1680)

Also: samuel butler.