The word pleochroism 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: 23
Highest Scoring Words With Friends™ Play In The Letters pleochroism
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Seven Letter Word Alert: (46 words)
chomper, chooser, chromel, chromes, ciphers, coeloms, coheirs, compels, compile, compose, coolers, copiers, creosol, crimple, heroics, heroism, hospice, implore, imposer, loopier, moocher, mooches, moorish, morphic, oosperm, orioles, polemic, polices, pomelos, pooches, porches, precool, prelims, promise, reclips, recoils, respool, rosehip, scooper, scorpio, simpler, spermic, spheric, splicer, spoiler, spooler