The word thermometers 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 thermometers
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Seven Letter Word Alert: (32 words)
emoters, heteros, meeters, meteors, mothers, rehomes, remeets, remorse, remoter, remotes, reshore, restore, retorts, retrees, rhetors, rosette, rotters, seether, sheerer, sheeter, shorter, smother, steerer, teemers, teeters, teether, teethes, tethers, theorem, thereto, thermos, tremors