The word leukocytosis 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 leukocytosis
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Seven Letter Word Alert: (53 words)
celsius, closest, closets, colossi, cookies, coolest, cooties, cosiest, cotyles, coyotes, cystous, cytosis, cytosol, ketosis, keyslot, lockets, lockout, lockset, locusts, loosest, lotuses, lucites, ocelots, oculist, oecists, oocysts, oocytes, oolites, ossicle, outkiss, outlies, outsole, sickest, sickles, sluices, society, sockets, soloist, solutes, sootily, stickle, stoolie, stylise, suckles, sulkies, systole, tickles, tissuey, tousles, toyless, toylike, tyloses, tylosis