The word sternwheeler 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 sternwheeler
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Seven Letter Word Alert: (27 words)
enterer, entrees, ethenes, reelers, reenter, reheels, relents, renewer, renters, rerents, retrees, seether, serener, sheerer, sheeter, shelter, sneerer, steerer, sterner, sweeten, sweeter, swelter, western, wheeler, wrenlet, wrester, wrestle