The word heliometers 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: 17
Highest Scoring Words With Friends™ Plays In The Letters heliometers
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Seven Letter Word Alert: (49 words)
eeriest, emoters, erotise, estriol, helmets, hermits, heroise, heroism, heteros, holiest, holster, homiest, hostile, hostler, isomere, loiters, meeters, melters, meshier, meteors, metrise, moister, mortise, mothers, motlier, omelets, reemits, reheels, rehomes, remeets, remelts, remotes, resmelt, retiles, retimes, roselet, seether, sheeter, shelter, slither, smelter, smother, steelie, sterile, teemers, telomer, theorem, thermos, toilers