The word disgruntling 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: 21
Highest Scoring Words With Friends™ Play In The Letters disgruntling
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Seven Letter Word Alert: (46 words)
dinging, dinting, dunging, dusting, gilding, girding, girling, girning, gliding, guiding, gurning, gusting, insulin, inturns, inulins, inuring, lignins, linings, listing, lunging, lusting, nudging, nursing, ridging, ridings, ringgit, ringing, rinsing, ruining, rulings, rusting, sidling, signing, silting, singing, sliding, suiting, surging, tidings, tilings, tinging, tunings, turning, uniting, unsling, urgings