KININ

Yes. "KININ" is in the ENABLE word list, accepted by Words With Friends and most open Scrabble apps. It scores 9 points in Scrabble and 11 points in Words With Friends.

In Scrabble, "KININ" is worth 9 points before bonuses. In Words With Friends, it's worth 11 points. Played on a triple-word-score, the Scrabble value becomes 27.

Any of various structurally related polypeptides of the autacoid family, such as bradykinin and kallikrein, that act locally to induce vasodilation and contraction of smooth muscle.

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