The word slaveholders 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 slaveholders
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Seven Letter Word Alert: (86 words)
adheres, adverse, aldoses, alveole, areoles, dashers, dealers, deashes, delvers, dollars, dorsals, earless, eldress, elodeas, evaders, halvers, headers, healder, healers, hearsed, hearses, heavers, heralds, herdess, holders, hollers, hoveled, hoveler, hovered, lashers, lassoed, lassoer, laveers, leaders, leasers, leashed, leashes, leavers, loaders, oarless, ordeals, overall, overled, oversea, raveled, redeals, reloads, resales, resaved, resaves, reseals, resells, reshave, reshoed, reshoes, resoled, resoles, resolve, reveals, rodless, salvers, savored, sealers, sellers, servals, several, shaders, shavers, sheared, sheaved, sheaves, shelled, sheller, shelved, shelver, shelves, shoaled, shovels, shovers, slashed, slasher, slavers, sleaves, sloshed, solders, solvers