The word prerequisites 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 prerequisites
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Seven Letter Word Alert: (57 words)
eeriest, esquire, persist, peruses, pesters, pieties, piquets, pissier, pitiers, presets, presser, priests, purists, pursers, pussier, queerer, querier, queries, querist, quieter, reequip, reissue, repique, repress, reprise, request, require, requite, respire, respite, resteps, resters, restirs, retiree, retires, retrees, retries, rustier, seepier, spirits, spriest, sprites, spurter, squires, squirts, steeper, steerer, stirrup, striper, stripes, stupers, suiters, suspire, tipsier, upriser, uprises, ureters