The word permissibility 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 permissibility
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Seven Letter Word Alert: (76 words)
betrims, biprism, bitsier, blister, bristle, bristly, elitism, emptily, ileitis, imperil, impiety, implies, impress, liberty, limbers, limiter, limpest, limpets, lispers, lyrists, messily, miserly, misrely, missile, misstep, misters, mistier, mistily, mistype, myrtles, permits, persist, pietism, pissier, pistils, pitiers, pitless, prelims, premiss, priests, pyrites, relists, resplit, ribless, riblets, rimless, risible, siltier, similes, simpers, simpler, simples, slimier, smilers, smileys, smilier, smiters, spirits, spriest, sprites, spryest, stimies, stripes, stripey, stylers, stylier, stylise, stymies, timbers, timbrel, timbres, tipless, tipsier, tipsily, trembly, triples