Yes, DIVERSION is a Scrabble word!

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

Is it a valid word?

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

an activity that diverts or amuses or stimulates
a turning aside (of your course or attention or concern)
an attack calculated to draw enemy defense away from the point of the principal attack

Also: diversionary attack.