The word persuasiveness 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: 23
Highest Scoring Words With Friends™ Play In The Letters persuasiveness
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Seven Letter Word Alert: (58 words)
asepses, asepsis, asperse, aspires, assures, avenues, ensears, ensures, enviers, eupneas, insures, inverse, issuers, pansies, paresis, passers, passive, peevers, penises, pensive, peruses, praises, presses, prevues, purines, pussier, pussies, ravines, reissue, repaves, repines, resaves, resnaps, respans, respins, revenue, revises, sassier, seepier, serapes, sinuses, snipers, spireas, sprains, sunrise, surpass, suspire, unpairs, unparse, unreeve, upraise, uprisen, uprises, ureases, veneers, versine, vespers, viruses