The word shellacking 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 shellacking
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Seven Letter Word Alert: (40 words)
angelic, calling, cashing, ceasing, celling, changes, chasing, english, gaslike, genials, glances, hacking, hackles, haglike, hankies, healing, helical, inhales, lacings, lacking, lashing, leaking, leasing, leching, lichens, linkage, nickase, nickels, nickles, sacking, saclike, scaling, sealing, selling, shackle, shaking, shellac, shingle, sinkage, slacken