Yes, CANTORS is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, N 1, T 1, O 1, R 1, S 1.

Is it a valid word?

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

the musical director of a choir
the official of a synagogue who conducts the liturgical part of the service and sings or chants the prayers intended to be performed as solos