The word polyvalencies 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: 28
Highest Scoring Words With Friends™ Play In The Letters polyvalencies
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Seven Letter Word Alert: (79 words)
acyloin, alcoves, alpeens, alpines, alveole, alveoli, callose, calypso, celosia, cleanly, cleanse, cleaves, closely, coalise, collies, collins, conveys, covines, cyanise, cyanose, cypsela, eclipse, ellipse, enclasp, enclave, enclose, enolase, enslave, envelop, epsilon, evasion, evinces, inclasp, inplace, inscape, leavens, license, locales, naively, novella, novices, oilcans, opaline, ovicell, ovinely, paisley, panicle, pelican, pencase, pencils, pensive, peonies, plainly, pleions, pliancy, plosive, polices, pollens, scalene, scallop, scalpel, sealion, silence, soapily, spaniel, special, spelean, splenic, sylvine, syncope, synovia, valence, valency, valleys, vesical, vesicle, vocally, volleys, yeelins