The word understock 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: 20
Highest Scoring Words With Friends™ Plays In The Letters understock
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Seven Letter Word Alert: (54 words)
conkers, cornets, counted, counter, coursed, courted, crudest, crunode, crusted, decrust, destock, detours, dockens, dockers, dockets, duckers, ductors, eductor, encrust, reckons, recount, redocks, reducts, reknots, resound, restock, restuck, rockets, rodents, rotunds, scorned, scoured, scouted, scouter, snorted, snouted, sounder, sourced, stocked, stocker, stroked, sundeck, tonsure, trounce, trucked, trunked, tuckers, uncords, uncored, uncorks, undocks, undoers, undrest, unstock