The word steelworkers 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: 20
Highest Scoring Words With Friends™ Play In The Letters steelworkers
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Seven Letter Word Alert: (39 words)
kestrel, ketoses, osselet, ostlers, reekers, reelers, reseeks, reskews, resoles, resorts, resters, restoke, restore, reswore, retrees, reworks, rewrote, roselet, rosters, seekers, skelter, skewers, sleeker, slowest, sorrels, sorters, steerer, stereos, sterols, stokers, stroker, strokes, sweeter, swelter, toeless, trowels, workers, wrester, wrestle