The word somniferous 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™ Play In The Letters somniferous
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Seven Letter Word Alert: (35 words)
erosion, fermion, firmoss, fissure, fusions, fussier, informs, infuser, infuses, infusor, insures, ionomer, isomers, minuses, misuser, mossier, mousers, mousier, noisome, noosers, ominous, onerous, seniors, serious, sermons, somonis, sooners, sunrise, sunroof, sunroom, surmise, unforms, uniform, urnmoss, urosome