The word miscalculate 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: 24
Highest Scoring Words With Friends™ Plays In The Letters miscalculate
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Seven Letter Word Alert: (54 words)
accites, acclaim, accusal, acicula, actuals, acuates, alliums, alltime, alumels, amulets, ascetic, cacemia, caesium, calamus, calcite, calcium, calculi, calicle, calmest, calumet, castile, catcall, caustic, celcius, cellist, clastic, clausal, climate, cultism, cuticle, elastic, emulsic, laciest, lactase, lacteal, leucism, lucites, macules, malaise, malices, mallets, malleus, metical, micella, millets, miscall, mistell, mullets, mullite, musical, saccate, sulcate, tallies, tamales