The word implicitness 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: 23
Highest Scoring Words With Friends™ Play In The Letters implicitness
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Seven Letter Word Alert: (45 words)
cesspit, clients, elicits, elitism, enlists, iciness, ileitis, implies, incests, incises, incites, insects, inspect, insteps, limpest, limpets, listens, menisci, miscite, mispens, missile, misstep, pectins, pelitic, pencils, pietism, pinless, pistils, pitless, seismic, septics, silents, similes, simples, spinels, spinets, splenic, splices, splines, splints, stencil, stimies, tiepins, tinsels, tipless