Yes, RESTORATIONS is a Scrabble word!

Letter values in Scrabble US: R 1, E 1, S 1, T 1, O 1, R 1, A 1, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

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

the reign of Charles II in England; 1660-1685
the act of restoring something or someone to a satisfactory state
getting something back again
the state of being restored to its former good condition
some artifact that has been restored or reconstructed
a model that represents the landscape of a former geological age or that represents and extinct animal etc.
the re-establishment of the British monarchy in 1660