The word tremolites 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: 14
Highest Scoring Words With Friends™ Play In The Letters tremolites
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Seven Letter Word Alert: (44 words)
emitter, emoters, erotise, estriol, isomere, itemset, letters, litters, loiters, melters, meteors, metrise, metrist, mettles, moister, mortise, motlier, mottler, mottles, omelets, omitter, reemits, remelts, remotes, resmelt, retiles, retilts, retimes, retitle, roselet, rosette, settler, slitter, smelter, sterile, stilter, teleost, telomer, termite, testier, tilters, toilers, toilets, trestle