RET

Yes. "RET" is in the ENABLE word list, accepted by Words With Friends and most open Scrabble apps. It scores 3 points in Scrabble and 3 points in Words With Friends.

In Scrabble, "RET" is worth 3 points before bonuses. In Words With Friends, it's worth 3 points. Played on a triple-word-score, the Scrabble value becomes 9.

To prepare (flax, hemp etc.) for further processing by soaking, which facilitates separation of fibers from the woody parts of the stem.

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