KEG

Yes. "KEG" is in the ENABLE word list, accepted by Words With Friends and most open Scrabble apps. It scores 8 points in Scrabble and 9 points in Words With Friends.

In Scrabble, "KEG" is worth 8 points before bonuses. In Words With Friends, it's worth 9 points. Played on a triple-word-score, the Scrabble value becomes 24.

A round, traditionally wooden container of lesser capacity than a barrel, often used to store beer.

No, "KEG" has no anagrams in the ENABLE dictionary — it's the only word that can be formed from its exact letters.