The word permutable is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 21
Highest Scoring Words With Friends™ Play In The Letters permutable
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Seven Letter Word Alert: (23 words)
amputee, beamlet, beermat, bleater, brumate, emulate, epaulet, epurate, mutable, permute, pleurae, plumber, prelate, premelt, reblame, replate, repleat, replumb, tempera, tempura, trample, tremble, tumbler