The word misidentifies 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: 21
Highest Scoring Words With Friends™ Play In The Letters misidentifies
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Seven Letter Word Alert: (32 words)
defines, deifies, deities, dements, demises, demists, densest, destine, dieties, dietine, diimine, dimness, dissent, edifies, finesse, fitness, imidine, indites, infests, insides, itemise, mindset, misedit, misfeed, misfits, nemesis, seitens, sestine, siemens, snidest, stimied, stimies