The word thermidors 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: 16
Highest Scoring Words With Friends™ Play In The Letters thermidors
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Seven Letter Word Alert: (36 words)
dehorts, dithers, dormers, editors, ethmoid, hermits, heroism, hoisted, homiest, horsier, methods, misdoer, moister, mortise, mothers, retrims, rhetors, rioters, roisted, roister, shirted, shorted, shorter, smother, sortied, steroid, stirred, storied, stormed, strider, stridor, thermos, tierods, tremors, tridems, trimers