The word depositary 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: 16
Highest Scoring Words With Friends™ Plays In The Letters depositary
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Seven Letter Word Alert: (59 words)
adipose, adopter, aridest, aspired, astride, astroid, daytrip, departs, deports, deposit, despair, destroy, diapers, dietary, diopter, dioptre, disrate, dopiest, editors, isotype, opiated, opiates, parotid, parties, pastier, paydirt, peridot, periods, petards, pirated, pirates, posited, praised, pyrites, readopt, roadies, roasted, roisted, ropiest, seaport, soapier, sortied, spidery, spirted, sported, sprayed, steroid, storied, strayed, striped, stripey, tierods, tirades, topiary, topside, torpids, traipse, tripeds, tripods