The word waterpowers 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™ Play In The Letters waterpowers
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Seven Letter Word Alert: (49 words)
operate, parrots, pewters, porters, postwar, praetor, praters, presort, prorate, raptors, reapers, rearose, reparse, repaste, repeats, reports, reposer, repower, rerapes, reroast, restore, restrap, reswear, reswept, reswore, retapes, retears, retraps, rewater, rewraps, rewrapt, rewrote, roaster, roseate, sapwort, sawwort, seaport, serrate, sparrow, spearer, swearer, sweater, taperer, tarrows, tearers, warpers, waterer, wearers, wrester