The word impoverishes 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: 24
Highest Scoring Words With Friends™ Play In The Letters impoverishes
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Seven Letter Word Alert: (47 words)
empires, empress, epimers, episome, erosive, heiress, heroise, heroism, hissier, hosiers, imposer, imposes, impress, improve, isomere, isomers, ivories, meioses, meiosis, meshers, meshier, messier, misship, mossier, peevish, pissier, poesies, premise, premiss, promise, rehomes, removes, reposes, reshims, reships, reshoes, revises, rosehip, shivers, shovers, shrimps, simpers, soirees, spheres, verismo, verisms, vespers