The word prothoraxes 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: 23
Highest Scoring Words With Friends™ Play In The Letters prothoraxes
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Seven Letter Word Alert: (41 words)
earshot, exhorts, exports, hapters, harpers, hoarser, hoaxers, orators, oxheart, parrots, phraser, poorest, porters, pothers, praetor, praters, presort, prorate, raptors, reports, reroast, reroots, reshoot, restrap, retraps, rhetors, roaster, rooster, rooters, seaport, sharper, shooter, shorter, soother, stooper, strophe, teashop, tephras, torpors, trasher, trooper