The word backslappers 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: 29
Highest Scoring Words With Friends™ Play In The Letters backslappers
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Seven Letter Word Alert: (46 words)
abasers, abrases, apparel, appeals, appears, backers, balkers, blacker, braless, cablers, capable, capless, carless, carpals, carpels, clapper, clasper, escarps, packers, palaces, parable, parcels, parsecs, pascals, placers, prepack, rappels, rascals, rebacks, reclasp, reclass, repacks, sackers, sacrals, sappers, sarapes, scalars, scalers, scalper, scarabs, scleras, scrapes, slacker, spacers, spackle, sparkle