The word permutability 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: 26
Highest Scoring Words With Friends™ Play In The Letters permutability
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Seven Letter Word Alert: (76 words)
ability, abutter, airtime, balmier, battery, battier, battler, bilayer, biliary, bimetal, bitpart, bitrate, bittier, brittle, brumate, bulimia, bumpier, buttery, emptily, imitate, impaler, imperil, impiety, irately, lamprey, laytime, lempira, liberty, limiter, lumpier, maltier, marlite, meatily, militar, muriate, mutable, mutably, palmier, petabit, pettily, platter, plumber, plumier, prattle, prelaty, primate, primula, pteryla, puberty, puttier, ratbite, reality, rebuilt, replait, replumb, tearily, tempura, terabit, terbium, tertial, timbale, timbrel, titular, trample, trembly, triable, tribute, triplet, tritium, trumpet, tumbler, typebar, uralite, utility, utterly, yttrium