The word slanderers 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: 13
Highest Scoring Words With Friends™ Plays In The Letters slanderers
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Seven Letter Word Alert: (41 words)
darners, dealers, dresser, earless, earners, eldress, endears, endless, enlards, enseals, ensears, erasers, errands, landers, larders, leaders, leaners, learned, learner, leasers, lenders, readers, realers, redeals, redness, redress, relearn, renders, rereads, resales, resands, reseals, resends, sanders, sealers, senders, slander, slender, snarers, snarled, snarler