The word polyhedrons 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: 21
Highest Scoring Words With Friends™ Play In The Letters polyhedrons
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Seven Letter Word Alert: (30 words)
dehorns, deploys, holders, honored, hydrops, leprosy, noodles, onshore, operons, phenols, phenyls, phoneys, phrensy, polyose, ponders, poodles, presold, pronely, prosody, pyrones, respond, respool, snooped, snooper, spooled, spooler, spooned, spoored, spyhole, yodlers