The word osteoclasis 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: 15
Highest Scoring Words With Friends™ Plays In The Letters osteoclasis
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Seven Letter Word Alert: (35 words)
alecost, aloetic, ascites, castile, castles, celosia, classes, closest, closets, coalise, coalite, colossi, coolest, cooties, cosiest, elastic, isolate, laciest, lactose, lassies, lassoes, locates, loosest, ocelots, oecists, oolites, ossicle, sacless, siestas, socials, solaces, soloist, stoical, stoolie, tassels