The word masterworts 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: 17
Highest Scoring Words With Friends™ Play In The Letters masterworts
:
Seven Letter Word Alert: (43 words)
armrest, arrests, maestro, marrows, masters, matters, mortars, rasters, ratters, reroast, resorts, restart, reswarm, retoast, retorts, rewarms, roamers, roaster, rosters, rotates, rotters, seamost, seaworm, smarter, smatter, soarers, sorters, starers, starter, staters, stomate, streams, stroams, swarmer, swatter, tarrows, tasters, toaster, tremors, warmers, warmest, wasters, wormers