The word cryptococcosis is playable in Words With Friends™, but due to the frequency of letters in the game of Words With Friends™, 2 blanks substituting for the letters c and c are 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 cryptococcosis
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Seven Letter Word Alert: (13 words)
copyist, cryptic, cytosis, oocysts, oocytic, ooscopy, porosis, porotic, portico, prootic, scorpio, scripts, tropics