The word slaveholding 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: 24
Highest Scoring Words With Friends™ Play In The Letters slaveholding
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Seven Letter Word Alert: (79 words)
adonise, agonies, agonise, aligned, alveoli, anodise, anviled, dangles, dashing, dealign, dealing, deaving, delving, denials, devisal, dialogs, dogvane, dollies, dolling, doveish, eloigns, english, evading, evasion, galleon, gallons, genials, geoidal, gnashed, goalies, goldens, halides, halogen, halving, handles, heading, headons, healing, heaving, hindleg, hoagies, holding, hollies, indoles, inhaled, inhales, invades, ladings, ladling, lashing, leading, leasing, leaving, legions, ligands, lingoes, loading, longish, lovages, novella, salving, sandhog, sealing, sealion, selling, shading, shaving, shilled, shingle, shoaled, shoeing, shoving, singled, slanged, slaving, snailed, solving, vialled, village