The word perseverates 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: 19
Highest Scoring Words With Friends™ Plays In The Letters perseverates
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Seven Letter Word Alert: (57 words)
arrests, asperse, averser, averter, erasers, parsers, pasters, peevers, pervert, pesters, praters, presets, presser, raspers, rasters, reapers, reavers, reparse, repaste, repasts, repaver, repaves, repeats, repress, rerapes, resaves, reseats, reserve, resteps, resters, restrap, retapes, retears, retraps, retrees, reveres, reverse, reverts, seaters, serapes, serrate, servers, severer, sparers, sparest, sparser, spearer, starers, starver, starves, steeper, steerer, taperer, tearers, teasers, teepees, vespers