The word plasticities 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™ Plays In The Letters plasticities
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Seven Letter Word Alert: (49 words)
aplites, aplitic, ascites, aseptic, aspects, capless, caplets, castile, castles, cesspit, ciliate, elastic, elicits, elitist, icepail, ileitis, italics, laciest, laicise, latites, lattice, liaises, lipases, palsies, pastels, pasties, patties, pelitic, pietist, pilates, pistils, pitless, plastic, plicate, septics, silicas, spastic, special, spicate, spittle, splices, stalest, staples, statice, statics, stipite, tactile, tipcats, tipless