The word perpetuates 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: 18
Highest Scoring Words With Friends™ Play In The Letters perpetuates
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Seven Letter Word Alert: (33 words)
astuter, austere, epurate, estuate, euaster, pasteup, pasture, patters, paupers, peepers, pretape, pretest, pupates, putters, repaste, repeats, restate, retapes, retaste, septate, spatter, sputter, startup, stature, steeper, stepper, tappers, tapster, teeters, trustee, uprates, upstart, upstate