The word multiplicities 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: 26
Highest Scoring Words With Friends™ Play In The Letters multiplicities
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Seven Letter Word Alert: (43 words)
cellist, cultism, cultist, cutlets, elicits, elitism, elitist, emulsic, ileitis, illicit, illites, illitic, impetus, implies, impulse, leucism, limelit, limpest, limpets, lucites, lutites, millets, miscite, mistell, mitiest, mullets, mullite, pelitic, pietism, pietist, pullets, pumices, putties, scuttle, silicle, spicule, spittle, stimuli, stipite, stipule, titmice, uptimes, utilise