The word grandmasters 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: 19
Highest Scoring Words With Friends™ Play In The Letters grandmasters
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Seven Letter Word Alert: (83 words)
agendas, amassed, argents, armrest, arrange, arrests, artsman, artsmen, damager, damages, damners, dangers, darners, darters, demasts, desmans, dragnet, eartags, errands, errants, ganders, gardens, garment, garners, garnets, garrets, garters, gateman, gnarred, gradate, graders, grander, grandma, granted, granter, grassed, graters, madness, magenta, magnate, magnets, managed, manager, manages, mandate, mangers, mantras, margate, martens, massage, masters, megarad, nametag, narrate, rangers, ranters, rasters, redrags, regards, regrant, remands, resands, retards, sanders, searats, seastar, smarted, smarten, smarter, snarers, stagers, stamens, stander, starers, starred, strands, strange, streams, tanager, tandems, tangram, teargas, traders