The word rehearsing 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: 15
Highest Scoring Words With Friends™ Plays In The Letters rehearsing
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Seven Letter Word Alert: (38 words)
angrier, arsheen, arshine, earners, earring, enrages, erasing, gainers, garners, garnish, girners, gnasher, grainer, greaser, greisen, hangers, hearers, hearing, hernias, herring, rangers, rangier, rearing, rearise, regains, regears, rehangs, rehears, rehinge, rehires, reigner, rerinse, reshare, reshine, ringers, searing, sharing, shearer