The word polystyrenes 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™ Plays In The Letters polystyrenes
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Seven Letter Word Alert: (78 words)
elopers, enstyle, entropy, estrone, eyespot, leprosy, leptons, neotype, nesters, nestles, netless, onestep, openers, openest, ospreys, osselet, ostlers, oysters, pelters, pentose, persons, pesters, pestles, petless, petrels, petrols, poetess, polyyne, postern, posters, poteens, prenote, present, presets, pronely, pronest, pyrones, relents, renests, reopens, repents, replots, reposes, reposts, resents, resoles, respelt, respots, resteps, restyle, retypes, roselet, sensory, serpent, slopers, spleens, spryest, steeply, stenose, stepson, stereos, sternly, sterols, stoners, storeys, stylers, stylops, styrene, systole, tensely, tensors, tersely, toeless, topless, toyless, tyloses, yelpers, yestern