The word breastworks 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: 21
Highest Scoring Words With Friends™ Play In The Letters breastworks
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Seven Letter Word Alert: (46 words)
aborter, arkoses, arrests, artwork, barkers, barrows, barters, baskets, basters, besorts, bestows, bestrow, boaster, boaters, borates, breasts, brokers, browser, browses, rasters, reboast, reroast, resoaks, resorbs, resorts, retasks, reworks, roaster, rosters, skaters, soakers, soarers, sorbate, sorbets, sorters, starers, starker, stokers, streaks, strobes, stroker, strokes, tarrows, taskers, wasters, workers