The word musclebuilding 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: 31
Highest Scoring Words With Friends™ Play In The Letters musclebuilding
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Seven Letter Word Alert: (81 words)
bedungs, belling, billing, billmen, blueing, blunged, blunges, bucines, budgies, budling, bulimic, bullied, bullies, bulling, bundles, bungled, bungles, ceiling, celling, climbed, cudgels, cuisine, culling, deicing, delimbs, dingies, dubnium, dueling, dulcing, dulling, dumbing, educing, eliding, eluding, emulsic, emulsin, guldens, gullied, gullies, illumed, incised, include, incubus, indices, indiums, induces, indulge, legumin, leucism, melding, menisci, midline, milling, mingled, mingles, minibus, miscued, mulling, muscled, nucleus, nuclide, selling, sibling, sidling, silicle, singled, slicing, sliding, sliming, sluiced, smidgen, smidgin, smiling, subcell, subduce, sublime, submenu, suicide, sullied, uncubed, unglued