The word superimposed 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 superimposed
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Seven Letter Word Alert: (93 words)
demirep, demises, deposer, deposes, depress, desires, despise, dippers, dispose, dossier, dousers, dressup, dumpers, dumpier, empires, empress, epiderm, epimers, epipods, episode, episome, espouse, impedes, imposed, imposer, imposes, impress, isomere, isomers, meioses, messier, misdoer, misdoes, misused, misuser, moppers, mossier, mousers, mousier, moussed, muroids, oppress, periods, perused, peruses, podiums, poesies, poseurs, premise, premiss, preside, pressed, pressup, presume, primped, promise, pumpers, purpose, pussier, reissue, repiped, repipes, reposed, reposes, repumps, resides, residue, resumed, resumes, ruesome, serious, simpers, sippers, sodiums, soirees, soppers, soppier, soupier, speedup, spiders, spoused, spumier, sudsier, supered, suppers, suppose, supreme, surmise, suspire, umpired, umpires, uprises, upsides