The word prelatures 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: 15
Highest Scoring Words With Friends™ Plays In The Letters prelatures
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Seven Letter Word Alert: (58 words)
alerter, auletes, austere, elaters, eluates, epaulet, epurate, erasure, estrual, euaster, leapers, palters, pasture, pelters, perusal, petrels, plaster, platers, pleaser, pleurae, praters, prelate, presale, pulsate, rapture, realers, realest, realter, reapers, relapse, relater, relates, reparse, repaste, repeals, repeats, replate, repleat, repulse, rerapes, respelt, restrap, retapes, retears, retraps, rustler, saluter, serrate, spearer, spurter, stapler, stealer, surreal, taperer, tearers, uprates, uprears, ureters