The word illustrates 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: 14
Highest Scoring Words With Friends™ Play In The Letters illustrates
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Seven Letter Word Alert: (75 words)
airless, allures, arillus, artiest, artists, artless, astuter, attires, aulists, autists, estrual, iratest, latites, laurels, literal, litters, littler, lusters, lustier, lutists, lutites, rallies, rattles, realist, relists, resails, results, retails, retills, retilts, rillets, rituals, rustles, rutiles, sailers, saltier, saluter, salutes, satires, serials, sitters, situate, slaters, slatier, slitter, stalest, starlet, starlit, startle, staters, statues, stature, stellar, stiller, stilter, straits, stratus, striate, suiters, sullies, sutlers, tallest, tallier, tallies, taluses, tasters, tastier, tertial, tillers, tilters, titular, trellis, tsarist, turtles, uralite