The word inadvertency 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: 24
Highest Scoring Words With Friends™ Play In The Letters inadvertency
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Seven Letter Word Alert: (60 words)
activer, adenine, ancient, arenite, averted, cairned, cannery, cannier, canteen, cantred, catenin, catered, cayenne, centred, certain, created, cyanide, cyanine, cyanite, deanery, decayer, dentine, detrain, deviant, deviate, dienyne, dietary, enacted, enteric, enticed, enticer, entrain, evicted, evident, evinced, icetray, invader, naivety, nectary, nitrene, reacted, recaned, recited, reenact, riveted, tannery, tenancy, tindery, tradein, trained, trainee, tranced, triaene, variety, verdict, veteran, vintner, vraiced, yearend, yearned