Yes, bel is a Scrabble word!
...and is worth 5 points in Scrabble, and 7 points in Words with Friends
bel
Noun
1. A logarithmic unit of sound intensity equal to 10 decibels
2. Babylonian god of the earth; one of the supreme triad including Anu and Ea; earlier identified with En-lil
What Scrabble words can I make with the letters in bel?
2 Letter Words