Yes, SWASTIKAS is a Scrabble word!

Letter values in Scrabble US: S 1, W 4, A 1, S 1, T 1, I 1, K 5, A 1, S 1.

Is it a valid word?

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

the official emblem of the Nazi Party and the Third Reich; a cross with the arms bent at right angles in a clockwise direction

Not playable in Scrabble US: HAKENKREUZ.