The word sternwheelers 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™ Plays In The Letters sternwheelers
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Seven Letter Word Alert: (35 words)
enterer, entrees, ethenes, nesters, nestles, netless, reelers, reenter, reheels, relents, renests, renewer, renters, rerents, resents, resters, retrees, seether, seethes, serener, sheerer, sheeter, shelter, sneerer, steerer, sterner, sweeten, sweeter, swelter, western, wetness, wheeler, wrenlet, wrester, wrestle