Yes, CACODYLS is a Scrabble word!

Letter values in Scrabble US: C 3, A 1, C 3, O 1, D 2, Y 4, L 1, S 1.

Is it a valid word?

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

a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air
the univalent group derived from arsine

Also: tetramethyldiarsine, cacodyl group, cacodyl radical, arsenic group.