The word impostures 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: 17
Highest Scoring Words With Friends™ Play In The Letters impostures
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Seven Letter Word Alert: (74 words)
estrous, estrums, impetus, imports, imposer, imposes, impress, isomers, missort, misstep, misters, misuser, mitoses, moister, mopiest, mortise, mossier, mousers, mousier, musters, mustier, oestrus, ousters, permits, persist, piteous, poseurs, posters, posture, pouters, poutier, premiss, priests, primost, promise, purists, pussier, reposts, respots, restump, ropiest, rosiest, septums, serious, simpers, smiters, somites, sorties, soupier, sourest, spouter, spriest, sprites, sprouts, spumier, stomies, stomper, stories, stourie, stripes, stumper, stupers, stupors, suiters, suitors, surmise, suspire, toprims, toruses, tourism, troupes, umpires, uprises, uptimes