The word supercharger 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: 23
Highest Scoring Words With Friends™ Plays In The Letters supercharger
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Seven Letter Word Alert: (60 words)
archers, arguers, careers, carpers, charger, charges, cheaper, crasher, creaser, crusher, eparchs, erasure, escaper, grasper, greaser, harpers, heapers, hearers, parches, peaches, percher, perches, phraser, prerace, presage, purgers, reacher, reaches, reapers, reargue, recrush, recures, recurse, regears, regraph, regrasp, reheaps, rehears, repaces, repages, reparse, reperch, rerapes, rescuer, reshape, reshare, respace, resurge, reurges, scraper, securer, sharper, shearer, spearer, sprucer, spurrer, sugarer, upreach, uprears, usherer