The word illustrating 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™ Play In The Letters illustrating
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Seven Letter Word Alert: (51 words)
airguns, airings, aisling, anglist, arillus, arising, gastrin, guitars, install, instill, insular, intagli, intrust, intuits, lairing, langurs, lasting, lilting, lingual, listing, lugsail, lusting, railing, raising, ratings, ratting, rituals, rulings, rusting, rutting, sailing, salting, silting, sitting, slating, staring, starlit, stating, straint, suiting, tailgun, tailing, tasting, tauting, tilings, tilling, tilting, titular, transit, truants, urinals