The word multistorey 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: 18
Highest Scoring Words With Friends™ Plays In The Letters multistorey
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Seven Letter Word Alert: (57 words)
elusory, elutors, emulsor, estriol, litters, loiters, lottery, lousier, lustier, lutites, metrist, miserly, misrely, misrule, moister, moistly, mortise, motleys, motlier, mottler, mottles, mousier, mousily, mustier, mustily, mutters, myrtles, omitter, outlets, outlier, outlies, retilts, rustily, rutiles, slitter, stilter, stourie, stouter, stoutly, stylier, sutlery, testily, tilters, timeout, toilers, toilets, tourism, tourist, touters, trisomy, tryouts, turmoil, turtles, tutorly, tylotes, utterly, yttrium