The word rudderstock 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: 21
Highest Scoring Words With Friends™ Play In The Letters rudderstock
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Seven Letter Word Alert: (42 words)
corkers, coursed, courser, courted, crudest, crusted, decrust, deducts, destock, detours, dockers, dockets, duckers, ductors, eductor, records, recorks, rectors, redocks, reducts, restock, restuck, retours, rockers, rockets, rodders, routers, rudders, scoured, scourer, scouted, scouter, sourced, stocked, stocker, stroked, stroker, tourers, trouser, trucked, trucker, tuckers