The word illustrative 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 illustrative
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Seven Letter Word Alert: (75 words)
airiest, allures, arillus, artiest, astuter, attires, elitist, eluvial, estival, estrual, illites, ilvaite, iratest, irisate, latites, laurels, literal, litters, littler, lustier, lutites, rallies, rattles, realist, retails, retills, retilts, revisit, revuist, rillets, rituals, rivulet, rutiles, saltier, saluter, sillier, siltier, situate, slatier, slitter, starlet, starlit, startle, stative, stature, stellar, stiller, stilter, stivier, striate, surveil, tallest, tallier, tallies, tastier, tertial, tillers, tilters, titular, travels, trellis, trivets, trivial, turtles, uralite, utilise, uveitis, valuers, vaulter, veritas, virtual, virtues, vitelli, vitiate, vittles