Yes, JEZEBEL is a Scrabble word!

Letter values in Scrabble US: J 8, E 1, Z 10, E 1, B 3, E 1, L 1.

Is it a valid word?

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

wife of Ahab who was king of Israel; according to the Old Testament she was a cruel immoral queen who fostered the worship of Baal and tried to kill Elijah and other prophets of Israel (9th century BC)
a shameless impudent scheming woman