The word spellbinder 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™ Plays In The Letters spellbinder
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Seven Letter Word Alert: (49 words)
bellied, bellies, benders, bendier, binders, blender, blinder, bridles, brindle, deniers, derbies, dispell, edibles, ellipse, illbred, inbreds, inbreed, lenders, libeled, libeler, linseed, periled, prebend, prebill, presell, preside, rebells, rebills, rebinds, reblend, redline, relined, relines, repiled, repiles, repined, repines, replied, replies, respell, ripened, slender, spelled, speller, spender, spilled, spiller, spindle, splined