The word withholders 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: 20
Highest Scoring Words With Friends™ Play In The Letters withholders
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Seven Letter Word Alert: (43 words)
dehorts, dithers, doltish, dowlier, dowries, editors, estriol, hoisted, holders, holiest, holster, hostile, hostler, howlers, loiters, owliest, roisted, rowdies, shirted, shorted, showier, slither, soldier, sortied, steroid, storied, strowed, swirled, tierods, toilers, trowels, twirled, weirdos, whirled, whistle, whither, wholist, whorish, whorled, wildest, withers, writhed, writhes