The word predispose 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: 17
Highest Scoring Words With Friends™ Play In The Letters predispose
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Seven Letter Word Alert: (25 words)
deposer, deposes, depress, desires, despise, dippers, dispose, dossier, epipods, episode, oppress, periods, poesies, preside, pressed, repiped, repipes, reposed, reposes, resides, sippers, soirees, soppers, soppier, spiders