The word hydrothoraxes 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: 27
Highest Scoring Words With Friends™ Plays In The Letters hydrothoraxes
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Seven Letter Word Alert: (48 words)
adorers, darters, dearths, dehorts, destroy, dryrots, earshot, exhorts, hardest, harsher, hatreds, hearths, hoarder, hoarser, hoaxers, hoorays, hothead, hotrods, hydrate, hyraxes, orators, oratory, oxheart, oxherds, redroot, reroast, reroots, reshoot, retards, rhetors, roasted, roaster, roosted, rooster, rooters, shooter, shorted, shorter, soothed, soother, starred, strayed, strayer, threads, thready, traders, trashed, trasher