The word silverware 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: 18
Highest Scoring Words With Friends™ Play In The Letters silverware
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Seven Letter Word Alert: (33 words)
arrives, averser, earlier, laveers, leavers, realers, realise, rearise, reavers, reliers, relives, reswear, reveals, reviews, reviler, reviles, reviser, rewires, servile, several, swearer, swerver, swirler, veilers, viewers, wailers, waivers, waverer, wearers, wearier, wearies, weavers, weevils