The word masterwort 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: 16
Highest Scoring Words With Friends™ Play In The Letters masterwort
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Seven Letter Word Alert: (29 words)
armrest, maestro, marrows, matters, mortars, ratters, reroast, restart, reswarm, retoast, retorts, rewarms, roamers, roaster, rotates, rotters, seaworm, smarter, smatter, starter, stomate, swarmer, swatter, tarrows, toaster, tremors, warmers, warmest, wormers