The word brainworkers 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: 23
Highest Scoring Words With Friends™ Play In The Letters brainworkers
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Seven Letter Word Alert: (39 words)
airborn, bankers, barkers, barrens, barrier, barrows, bonkers, boranes, braiser, brasier, breakin, brisken, brisker, brokers, browner, brownie, browser, ironers, knowers, narrows, rainbow, rankers, reworks, ribwork, roarers, seaworn, skiwear, snakier, snowier, sorrier, swanker, warners, warrior, webinar, winkers, wonkier, workers, worrier, worries