The word polarimeter 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: 18
Highest Scoring Words With Friends™ Play In The Letters polarimeter
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Seven Letter Word Alert: (58 words)
airport, alerter, armoire, earlier, emirate, emperor, emptier, epitome, etaerio, impaler, implore, lempira, loamier, maltier, marlite, mealier, meatier, meatpie, miterer, motlier, operate, optimal, palmier, peatier, perlite, petiole, politer, praetor, prelate, premelt, premier, preterm, primate, prorate, realter, realtor, relater, remoter, repilot, replait, replate, repleat, replier, reprime, reptile, retimer, retrial, taperer, tearier, telomer, tempera, tempore, toprail, trailer, tramper, trample, tripole, trireme