The word balusters 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 balusters
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Seven Letter Word Alert: (28 words)
ablutes, abusers, artless, basters, blaster, bluster, braless, breasts, bursate, busters, bustler, bustles, butlers, estrual, lusters, reblast, results, rustles, saluter, salutes, slaters, stabler, stables, sublets, subtler, sutlers, taluses, tubless