The word arthrodesis 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: 14
Highest Scoring Words With Friends™ Play In The Letters arthrodesis
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Seven Letter Word Alert: (78 words)
adorers, aridest, arrests, artsier, ashiest, astride, astroid, darters, dashers, dearths, dehorts, disrate, dithers, dossier, earshot, editors, hairdos, hardest, hardier, hastier, hatreds, hoarder, hoarier, hoarser, hoisted, horsier, hosiers, raiders, raisers, rashers, rashest, rasters, reroast, resorts, restirs, retards, rhetors, rioters, roadies, roasted, roaster, roisted, roister, rosiest, rosters, satires, shaders, shadier, sharers, shirted, shorted, shorter, sierras, soarers, sorters, sortied, sorties, starers, starred, stashed, steroid, stirred, storied, stories, strider, strides, stridor, tardier, tarried, tarries, threads, tierods, tirades, toadish, traders, trashed, trasher, trashes