The word leucocytosis 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: 22
Highest Scoring Words With Friends™ Play In The Letters leucocytosis
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Seven Letter Word Alert: (48 words)
celcius, celsius, ciscoes, closest, closets, colossi, coolest, cooties, cosiest, cotyles, coyotes, cuticle, cyclise, cyclist, cystous, cytosis, cytosol, icecool, locusts, loosest, lotuses, lucites, occluse, occults, ocelots, oculist, oecists, oocysts, oocytes, oocytic, oolites, ossicle, outlies, outsole, sluices, society, soloist, solutes, sootily, stoolie, stuccos, stylise, systole, tissuey, tousles, toyless, tyloses, tylosis