The word pleochroisms 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 pleochroisms
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Seven Letter Word Alert: (83 words)
chisels, chomper, chooser, chooses, chromel, chromes, ciphers, closers, coeloms, coheirs, colossi, compels, compile, compose, coolers, copiers, corpses, creosol, cresols, crimple, heroics, heroism, hosiers, hospice, implore, imposer, imposes, impress, isohels, isomers, lispers, loopier, lossier, moocher, mooches, moorish, morphic, morsels, mossier, oosperm, orioles, ossicle, polemic, polices, pomelos, pooches, porches, poroses, porosis, precool, prelims, premiss, process, promise, reclips, recoils, reshims, reships, resoils, respool, rimless, rosehip, schleps, schools, schorls, scooper, scorpio, scrimps, shmoose, shrimps, simpers, simpler, simples, slicers, slopers, smilers, spermic, spheric, spicers, splicer, splices, spoiler, spooler