The word overmaster 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 overmaster
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Seven Letter Word Alert: (41 words)
armrest, averser, averter, emoters, maestro, meteors, mortars, overarm, overate, overeat, oversat, oversea, overset, reamers, rearose, reavers, remates, remorse, remoter, remotes, remover, removes, reroast, restore, reteams, retears, reverts, revotes, roamers, roaster, roseate, savorer, serovar, serrate, smarter, smearer, starver, steamer, tearers, tremors, vetoers