The word perpetrates 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 perpetrates
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Seven Letter Word Alert: (39 words)
paperer, patters, peepers, praters, prepare, pretape, pretest, rappers, ratters, reapers, repaper, reparse, repaste, repeats, rerapes, restart, restate, restrap, retapes, retaste, retears, retraps, retreat, retrees, septate, serrate, spatter, spearer, starter, steeper, steerer, stepper, taperer, tappers, tapster, tearers, teeters, trapper, treater