Yes, DIASPORAS is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, A 1, S 1, P 3, O 1, R 1, A 1, S 1.

Is it a valid word?

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

the body of Jews (or Jewish communities) outside Palestine or modern Israel
the dispersion of the Jews outside Israel; from the destruction of the temple in Jerusalem in 587-86 BC when they were exiled to Babylonia up to the present time
the dispersion or spreading of something that was originally localized (as a people or language or culture)