The word thimblerigs 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: 22
Highest Scoring Words With Friends™ Play In The Letters thimblerigs
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Seven Letter Word Alert: (36 words)
betrims, bitsier, blemish, blights, blister, blither, brights, bristle, elitism, gerbils, giblets, girlies, girlish, glister, gristle, herbist, hermits, lighter, limbers, limiter, mistier, relight, resight, riblets, risible, sighter, siltier, sleight, slimier, slither, smilier, thimble, tigrish, timbers, timbrel, timbres