The word powerwashing 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: 26
Highest Scoring Words With Friends™ Plays In The Letters powerwashing
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Seven Letter Word Alert: (89 words)
agonies, agonise, airshow, arshine, earwigs, engrasp, enwraps, erasing, gainers, garnish, gaspier, gawpers, gnasher, gnawers, gophers, hangers, harpies, harping, heaping, hearing, heparin, hernias, heroins, hoagies, horsing, ignores, inshore, iphones, ironage, ogreish, oranges, orphans, parings, parsing, persona, phasing, phonier, phonies, pigeons, pigwash, pingers, pingoes, preshow, prewash, rasping, reaping, regains, regions, rehangs, reshown, respawn, rosehip, rowwise, searing, seaworn, shaping, sharing, sharpen, sharpie, shewing, shoeing, shoring, showier, showing, signora, snowier, soapier, soaping, soaring, sparing, spawner, spewing, sponger, sporing, warping, warship, washing, waspier, weapons, wearing, wearish, whiners, whinger, whinges, whipsaw, whisper, wigeons, wingers, worship