The word monopolisers 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™ Play In The Letters monopolisers
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Seven Letter Word Alert: (61 words)
epsilon, erosion, implore, imposer, imposes, impress, insoles, ionomer, isomers, lesions, lioness, lispers, loonier, loonies, loopier, loosens, lossier, mispens, morsels, mossier, noisome, noosers, oleosin, oosperm, oospore, operons, orioles, persons, pinless, pleions, plosion, poisons, pomelos, poroses, porosis, prelims, premiss, prisons, proline, promise, resoils, respins, respool, rimless, seniors, sermons, simpers, simpler, simples, slopers, smilers, snipers, snooper, somonis, sooners, spinels, spinose, splines, spoiler, sponsor, spooler