The word crystallite 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: 18
Highest Scoring Words With Friends™ Plays In The Letters crystallite
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Seven Letter Word Alert: (87 words)
acetyls, aircell, alertly, article, artiest, attires, callers, cartels, castile, cattery, cattier, cattily, cellars, cellist, citrate, clarets, clarity, clatter, clayier, clearly, clerisy, clitter, cristae, crystal, eclairs, elastic, icetray, irately, iratest, laciest, latites, lattice, literal, litters, littler, lyrical, raciest, rallies, rattles, realist, reality, recalls, recital, retails, retally, retills, retilts, rillets, saltier, saltily, satiety, scalier, scarily, scarlet, scatter, scleral, slatier, slitter, starlet, starlit, startle, stately, statice, stellar, stiller, stilter, striate, stylate, stylier, tacitly, tactile, tallest, tallier, tallies, tastier, tastily, tearily, tertial, testacy, testily, tillers, tilters, treacly, trellis, trisect, trysail, yttrias