The word somnambulist 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: 24
Highest Scoring Words With Friends™ Plays In The Letters somnambulist
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Seven Letter Word Alert: (37 words)
albinos, albumin, amounts, atomism, aulists, bailout, bastion, biomass, bonsais, botulin, butanol, insults, mimosas, moulins, muslins, obtains, omnibus, osmiums, outmans, outsail, sabinos, salmons, solanum, stanols, sublist, submits, subslot, subsoil, sultans, summits, summons, sustain, tonsils, tsunami, unbaits, unbolts, unlists