The word silverworkers 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: 25
Highest Scoring Words With Friends™ Plays In The Letters silverworkers
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Seven Letter Word Alert: (43 words)
erosive, evokers, lorries, lossier, overlie, oversew, reliers, relives, reskews, resoils, resoles, resolve, reswore, reviews, reviler, reviles, reviser, revises, revoker, revokes, rewires, reworks, riskers, servers, servile, silvers, skewers, slivers, soirees, solvers, sorrels, sorrier, swerver, swerves, swirler, swivels, veilers, viewers, vowless, weevils, workers, worrier, worries