The word overmasters 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: 18
Highest Scoring Words With Friends™ Play In The Letters overmasters
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Seven Letter Word Alert: (63 words)
armrest, arrests, averser, averter, emoters, erasers, maestro, masters, meteors, mortars, overarm, overate, overeat, oversat, oversea, overset, rasters, reamers, rearose, reavers, remates, remorse, remoter, remotes, remover, removes, reroast, resaves, reseats, resorts, restems, resters, restore, reteams, retears, reverts, revotes, roamers, roaster, roseate, rosters, savorer, seamers, seamost, seaters, serovar, serrate, servers, smarter, smearer, soarers, sorters, starers, starver, starves, steamer, stereos, streams, stroams, tearers, teasers, tremors, vetoers