The word implausibility 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: 28
Highest Scoring Words With Friends™ Play In The Letters implausibility
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Seven Letter Word Alert: (26 words)
ability, alliums, baptism, bitmaps, bitmill, bulimia, iambist, lamplit, lustily, militia, misplay, mistily, mustily, mutably, pablums, pallium, palmist, paystub, pitbull, pliably, saltily, slimily, stimuli, stipula, subpial, tipsily