Yes, DESTRUCTIONS is a Scrabble word!

Letter values in Scrabble US: D 2, E 1, S 1, T 1, R 1, U 1, C 3, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

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

the termination of something by causing so much damage to it that it cannot be repaired or no longer exists
an event (or the result of an event) that completely destroys something
a final state