The word obstreperous 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™ Plays In The Letters obstreperous
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Seven Letter Word Alert: (80 words)
besorts, bespots, booster, bootees, booters, busters, espouse, estrous, obtuser, oestrus, ousters, outsees, perturb, peruses, pesters, poetess, poorest, poroses, porters, poseurs, posters, posture, pourers, pouters, presets, presort, presser, probers, pursers, reboost, reboots, rebores, reburst, reports, reposer, reposes, reposts, repours, repress, reprobe, reroots, reroute, resorbs, resorps, resorts, respots, resteps, resters, restore, retours, rooster, rooters, rosters, routers, soberer, sorbets, sorters, sourest, soursop, spouter, sprouts, spurter, stereos, stooper, strobes, stupers, stupors, subport, subsort, subtree, torpors, toruses, toupees, tourers, trooper, trouper, troupes, trouser, uproots, ureters