The word clotheshorses 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: 21
Highest Scoring Words With Friends™ Plays In The Letters clotheshorses
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Seven Letter Word Alert: (63 words)
chooser, chooses, chortle, closers, closest, closets, clothes, coheres, cohorts, colters, coolers, coolest, corsets, creoles, creosol, cresols, cresses, cresset, crosses, echoers, elector, escorts, etchers, heteros, holster, hostels, hostess, hostler, lechers, lessors, loosest, looters, ocelots, osselet, ostlers, rechose, reclose, resects, reshoes, reshoot, resoles, retches, retools, roselet, schools, schorls, scooter, secrets, sectors, selects, shelter, shooter, sloshes, soother, soothes, stereos, sterols, toeless, toolers, torches, tossers, tresses, trochee