Yes, HOOKAHS is a Scrabble word!

Letter values in Scrabble US: H 4, O 1, O 1, K 5, A 1, H 4, S 1.

Is it a valid word?

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

an oriental tobacco pipe with a long flexible tube connected to a container where the smoke is cooled by passing through water

Also: water pipe, hubble-bubble, hubbly-bubbly.

Not playable in Scrabble US: SHEESHA, SHISHA, CHICHA, CALEAN.