The word illustrate 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: 13
Highest Scoring Words With Friends™ Play In The Letters illustrate
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Seven Letter Word Alert: (47 words)
allures, arillus, artiest, astuter, attires, estrual, iratest, latites, laurels, literal, litters, littler, lustier, lutites, rallies, rattles, realist, retails, retills, retilts, rillets, rituals, rutiles, saltier, saluter, situate, slatier, slitter, starlet, starlit, startle, stature, stellar, stiller, stilter, striate, tallest, tallier, tallies, tastier, tertial, tillers, tilters, titular, trellis, turtles, uralite