Yes, CUBEBS is a Scrabble word!

Letter values in Scrabble US: C 3, U 1, B 3, E 1, B 3, S 1.

Is it a valid word?

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

spicy fruit of the cubeb vine; when dried and crushed is used medicinally or in perfumery and sometimes smoked in cigarettes
tropical southeast Asian shrubby vine bearing spicy berrylike fruits
a cigarette containing cubeb

Also: cubeb vine, java pepper, piper cubeba, cubeb cigarette.