The word misfunctioning 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: 29
Highest Scoring Words With Friends™ Play In The Letters misfunctioning
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Seven Letter Word Alert: (39 words)
coining, comfits, comings, confits, conning, consign, costing, cunning, fiction, finings, finning, gnomist, gnostic, iconism, iconist, innings, mincing, minions, minting, miscoin, misting, mousing, nonsuit, ousting, outings, sifting, sinning, smiting, somitic, stoning, suction, suiting, sunning, timings, tinning, tunings, unction, uniting, unstoic