The word silversmiths 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: 22
Highest Scoring Words With Friends™ Play In The Letters silversmiths
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Seven Letter Word Alert: (35 words)
elitism, hermits, hissers, hissier, hissies, limiter, missile, misters, mistier, relists, reshims, resists, revisit, rimless, shivers, shrivel, siltier, silvers, similes, sissier, sisters, slimier, slither, slivers, smilers, smilier, smiters, stimies, stivers, stivier, strives, theisms, thrives, verisms, verists