The word evaporometer 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: 22
Highest Scoring Words With Friends™ Plays In The Letters evaporometer
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Seven Letter Word Alert: (25 words)
averter, emperor, operate, overarm, overate, overeat, overtop, pervert, praetor, premeet, preterm, promote, prorate, remoter, remover, repaver, reprove, taperer, taproom, tearoom, tempera, tempore, tramper, trooper, vaporer