Yes, DEVASTATION is a Scrabble word!

Letter values in Scrabble US: D 2, E 1, V 4, A 1, S 1, T 1, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

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

the state of being decayed or destroyed
the feeling of being confounded or overwhelmed
an event that results in total destruction
plundering with excessive damage and destruction
the termination of something by causing so much damage to it that it cannot be repaired or no longer exists