The word masterstrokes 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™ Plays In The Letters masterstrokes
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Seven Letter Word Alert: (99 words)
arkoses, armrest, arrests, asserts, assorts, emoters, erasers, estates, ketoses, maestro, markers, markets, maskers, masters, matters, meerkat, meteors, mortars, rasters, ratters, reakers, reamers, rearose, remaker, remakes, remarks, remates, remorse, remoter, remotes, reroast, reseats, resoaks, resorts, restake, restart, restate, restems, resters, restoke, restore, retaker, retakes, retasks, retaste, reteams, retears, retests, retoast, retorts, retreat, roamers, roaster, roseate, rosette, rosters, rotates, rotters, seamers, seamost, seaters, serrate, sesames, sestets, setters, skaters, smarter, smatter, smearer, smokers, soakers, soarers, sorters, starers, starker, starter, staters, steamer, stereos, stokers, stomate, streaks, streams, streets, stroams, stroker, strokes, taskers, tasters, tearers, teasers, tersest, testers, toaster, tossers, treater, tremors, tresses, tsetses