The word malfunctioning 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: 30
Highest Scoring Words With Friends™ Play In The Letters malfunctioning
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Seven Letter Word Alert: (74 words)
alginic, angulon, anionic, antlion, atoning, auction, calming, canning, cannoli, canting, caution, cingula, cloning, coaling, coating, coiling, coining, conning, contain, cunning, faction, failing, faining, fanning, fiction, filming, finning, flaming, fluming, fluting, foaling, foaming, foiling, fouling, gainful, gluonic, inflict, intagli, lancing, lifting, limning, loafing, loaning, lofting, longfin, lunatic, mailing, malting, manning, mauling, mincing, minting, moaning, moating, molting, monilia, nailing, nominal, nonfact, nonflat, nonlung, nonmail, outgain, tailfin, tailgun, tailing, tanning, tinfoil, tinning, toiling, unalign, uncling, unction, uniting