The word perseverated 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: 20
Highest Scoring Words With Friends™ Plays In The Letters perseverated
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Seven Letter Word Alert: (80 words)
adepter, adverse, adverts, averred, averser, averted, averter, darters, dearest, deepest, deepsea, departs, deprave, deserve, drapers, evaders, everted, peevers, pervade, pervert, petards, petered, praters, predate, readers, reapers, reasted, reavers, redates, redrape, redtape, reested, reparse, repaste, repaved, repaver, repaves, repeats, reraped, rerapes, rereads, resaved, reserve, respade, restrap, retaped, retapes, retards, retears, retrade, retraps, retread, retreed, retrees, revered, reveres, reverse, reverts, sedater, serrate, severed, severer, sparred, speared, spearer, speeder, starred, starved, starver, steeped, steeper, steered, steerer, tapered, taperer, tasered, tearers, teepees, traders, treader