The word polariscope 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 polariscope
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Seven Letter Word Alert: (70 words)
aerosol, aircool, alcopop, applier, applies, apposer, apprise, caliper, calorie, carpels, carpool, celosia, clapper, clasper, clipper, coalers, coalier, coalise, coolers, copiers, coppers, crappie, creosol, cripple, eclairs, epicarp, escolar, icespar, loopier, loppers, opposer, oracles, orioles, papoose, parcels, paroles, placers, polaric, polices, poopers, poplars, precool, propels, propose, prosaic, rappels, reclasp, reclips, recoals, recoils, replica, respool, ripples, rosalic, roseola, sappier, scalier, scalper, scooper, scoriae, scorpio, slipper, soapier, solacer, soppier, spacier, special, splicer, spoiler, spooler