The word complexities 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: 29
Highest Scoring Words With Friends™ Play In The Letters complexities
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Seven Letter Word Alert: (56 words)
cleomes, coesite, coexist, colitis, compels, compete, compile, complex, coxitis, eclipse, elicits, elitism, emetics, empties, episome, epistle, epitome, epoxies, excepts, excites, exempts, exosmic, exotics, expects, exploit, exposit, implies, iolites, itemise, lexemic, limpest, limpets, meiotic, miscite, mopiest, oiliest, omelets, pectose, pelites, pelitic, petiole, pieties, pietism, poetics, poetise, polemic, polices, politic, poxiest, sextile, simplex, solicit, somitic, telecom, temples, toxemic