The word malfunctions 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™ Plays In The Letters malfunctions
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Seven Letter Word Alert: (61 words)
actions, amnions, amounts, anoints, antlion, atomics, atonics, auction, cannoli, cantons, cations, caution, columns, comfits, confits, consult, contain, cultism, faction, falcons, fanouts, faunist, fistula, flaunts, flotsam, foliums, fustian, incants, infants, lunatic, mansion, masonic, moulins, mucosal, musical, nations, nominal, nonfact, nonfast, nonflat, nonmail, nonsuit, oculist, oilcans, outmans, outsail, sanctum, solanum, somatic, stannic, stannum, stoical, suction, tinfuls, toucans, tsunami, unclots, uncoils, unction, unstain, unstoic