The word hectometers 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 hectometers
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Seven Letter Word Alert: (32 words)
chromes, coheres, cotters, echoers, emoters, etchers, heteros, meeters, meteors, mothers, rechose, rehomes, remeets, remotes, retches, rosette, schemer, secrete, seether, sheeter, smother, stretch, teemers, teeters, teether, teethes, tethers, theorem, thereto, thermos, torches, trochee