The word brimstones 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 brimstones
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Seven Letter Word Alert: (47 words)
benmost, besorts, betrims, bistros, boniest, bossier, bromine, bromise, bromite, entombs, inserts, isomers, mentors, meronts, minters, missort, misters, mitoses, mobster, moisten, moister, monster, mortise, mossier, norites, nosiest, orients, remints, riboses, rosiest, seniors, sermons, sinters, smiters, somites, sorbets, sorbite, sorties, stomies, stoners, stonier, stories, strobes, tensors, timbers, timbres, triones