The word stockpiled 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 stockpiled
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Seven Letter Word Alert: (41 words)
coedits, coldest, delicts, depicts, deposit, desktop, despoil, destock, deticks, dipoles, discept, dockets, dockise, dopiest, dotlike, lockets, lockset, pickets, pickled, pickles, piloted, pockets, podlike, poetics, pokiest, policed, polices, posited, sickled, skeptic, slicked, soliped, spliced, spoiled, sticked, stickle, stocked, tickled, tickles, toplike, topside