The word superclass 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™ Play In The Letters superclass
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Seven Letter Word Alert: (40 words)
alecups, assures, capless, capsule, carless, carpels, causers, clasper, classes, clauses, cupless, cussers, escarps, parcels, parsecs, passers, percuss, perusal, placers, plusses, pulsars, pulsers, reclasp, reclass, recusal, sacless, sapless, saucers, scalers, scalper, scleras, scrapes, scruple, secular, spacers, specula, spruces, sucrase, surpass, upscale