The word miscalculates 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: 25
Highest Scoring Words With Friends™ Play In The Letters miscalculates
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Seven Letter Word Alert: (81 words)
accites, acclaim, accusal, accuses, acicula, actuals, acuates, aimless, aliases, alliums, alltime, alumels, amulets, ascetic, ascites, assault, atlases, aulists, cacemia, caesium, calamus, calcite, calcium, calculi, calicle, calmest, calumet, castile, castles, casuals, catcall, caustic, celcius, cellist, celsius, cesiums, classic, clastic, clausal, clauses, climate, cultism, cuticle, elastic, emulsic, icemass, laciest, lactase, lacteal, leucism, lucites, macules, malaise, malices, mallets, malleus, metical, micella, millets, miscall, miscast, miscues, miscuts, misseat, mistell, mueslis, mullets, mullite, muscles, musical, saccate, salamis, salutes, satsuma, scillas, sluices, sulcate, sullies, tallies, taluses, tamales