The word thermopiles 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: 20
Highest Scoring Words With Friends™ Play In The Letters thermopiles
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Seven Letter Word Alert: (95 words)
elopers, emoters, empires, emptier, empties, epimers, episome, epistle, epitome, erotise, estriol, helmets, helpers, heptose, hermits, heroise, heroism, heteros, holiest, holster, homiest, hoplite, hostile, hostler, implore, imports, imposer, isomere, limpest, limpets, loiters, melters, meshier, meteors, metrise, moister, mopiest, mortise, mothers, motlier, omelets, pelites, pelters, perlite, permits, petiole, petrels, petrols, philter, philtre, poetise, politer, pothers, prelims, premelt, premise, primost, promise, reemits, rehomes, remelts, remotes, repiles, repilot, replies, replots, reptile, resmelt, respelt, respite, resplit, retiles, retimes, ropiest, rosehip, roselet, shelter, simpler, slither, smelter, smother, spoiler, sterile, stomper, strophe, telomer, tempers, temples, tempore, theorem, thermos, toilers, toprims, triples, tripole