The word silverbacks 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: 26
Highest Scoring Words With Friends™ Play In The Letters silverbacks
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Seven Letter Word Alert: (52 words)
abscise, abseils, airless, ascribe, backers, balkers, balkier, bickers, bilkers, blacker, braises, braless, cablers, caliber, calibre, carless, caviler, clavier, eclairs, kaisers, lickers, rebacks, reclass, resails, ribless, sackers, saclike, sailers, salvers, scabies, scalers, scalier, scarves, scleras, scribal, scribes, seasick, serials, servals, sickles, silvers, skiable, slacker, slavers, slicers, slicker, slivers, varices, velaric, verbals, vesical, viscera