The word pyrolusite 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™ Plays In The Letters pyrolusite
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Seven Letter Word Alert: (44 words)
elusory, elutors, estriol, isotype, leprosy, leprous, loiters, lousier, lustier, outlier, outlies, outyelp, petrols, piously, piteous, plouter, politer, posture, poulter, poultry, pouters, poutier, pylorus, pyrites, repilot, replots, resplit, ropiest, rustily, rutiles, slipout, soupier, spoiler, sporule, spouter, stipule, stourie, stripey, stylier, sutlery, toilers, triples, tripole, troupes