The word silverworker 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: 24
Highest Scoring Words With Friends™ Play In The Letters silverworker
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Seven Letter Word Alert: (27 words)
erosive, evokers, lorries, overlie, oversew, reliers, relives, resolve, reswore, reviews, reviler, reviles, reviser, revoker, revokes, rewires, reworks, servile, sorrier, swerver, swirler, veilers, viewers, weevils, workers, worrier, worries