Yes, BETEL is a Scrabble word!

Letter values in Scrabble US: B 3, E 1, T 1, E 1, L 1.

Is it a valid word?

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

Asian pepper plant whose dried leaves are chewed with betel nut (seed of the betel palm) by southeast Asians

Also: betel pepper, piper betel.