The word predisposing 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: 22
Highest Scoring Words With Friends™ Plays In The Letters predisposing
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Seven Letter Word Alert: (90 words)
designs, digress, dingier, dingies, dippers, dippier, dipping, dispose, dissing, dossier, engross, epipods, eroding, gipsies, gripped, groined, grossed, ignored, ignores, indigos, indorse, ingress, insider, insides, inspire, iodines, iodiser, iodises, ionised, ioniser, ionises, ironies, isospin, negroid, nippers, nippier, noisier, oppress, origins, pepsins, periods, persons, pigeons, pigpens, pingers, pingoes, pisoids, pissier, poising, ponders, priding, prisons, pronged, propine, redoing, regions, resigns, respins, respond, ridings, ripping, risings, rosined, seniors, sidings, signers, signors, singers, sinoids, sippers, sipping, snipers, snipped, snipper, sodgers, soppers, soppier, sopping, spiders, spinier, spinode, spinose, spionid, spiring, spiroid, sponged, sponger, sponges, sporing, springs