The word hydrometers 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: 19
Highest Scoring Words With Friends™ Plays In The Letters hydrometers
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Seven Letter Word Alert: (32 words)
dehorts, demotes, destroy, dormers, dryrots, emoters, eyeshot, herders, heteros, homered, meteors, methods, modesty, moseyed, mothers, rehomed, rehomes, remorse, remoter, remotes, reshoed, reshore, restore, rhetors, rhymers, shorted, shorter, smother, stormed, theorem, thermos, tremors