The word misaddressed 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: 18
Highest Scoring Words With Friends™ Plays In The Letters misaddressed
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Seven Letter Word Alert: (41 words)
address, admired, admires, daddies, deaired, dearies, demised, demises, derided, derides, desired, desires, desmids, diadems, disarms, disease, dreaded, dreamed, dressed, dresses, madders, messier, misadds, misdeed, misread, readded, readied, readies, readmes, resided, resides, sadisms, sassier, seamers, seamier, seaside, seriema, sesames, siamese, sidearm, smeared