The word plasticines 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: 19
Highest Scoring Words With Friends™ Play In The Letters plasticines
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Seven Letter Word Alert: (93 words)
alpines, aplites, aplitic, aptness, ascents, ascites, aseptic, aspects, cantles, capless, caplets, caseins, castile, castles, catnips, cesspit, ciliate, clients, elastic, elastin, elicits, enclasp, enlists, entails, icepail, iciness, incests, incises, incites, inclasp, inplace, inscape, insects, inspect, insteps, italics, laciest, laicise, lancets, liaises, lipases, listens, nailset, napless, palsies, panicle, pansies, panties, pastels, pasties, patines, pectins, pelican, pelitic, pencils, pentail, pianist, picante, pilates, pinless, pintail, pistils, pitless, planets, plastic, plicate, salient, salines, secants, seitans, septics, sestina, silanes, silents, silicas, spaniel, spastic, special, spicate, spinals, spinels, spinets, splenic, splices, splines, splints, stances, staples, stencil, tailpin, tiepins, tinsels, tipless