The word lymphocytosis 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: 29
Highest Scoring Words With Friends™ Play In The Letters lymphocytosis
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Seven Letter Word Alert: (37 words)
chymist, colossi, coltish, compost, copilot, copyist, cytosis, cytosol, isotypy, miscopy, moistly, mycosis, myotics, mystics, oocysts, ooliths, osmotic, physics, pistols, postils, psychos, pyocyst, schools, sitcoms, smoochy, smooths, smoothy, soloist, soothly, sootily, splotch, stylish, stylops, sylphic, topsoil, toyshop, tylosis