The word eosinophils 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: 18
Highest Scoring Words With Friends™ Play In The Letters eosinophils
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Seven Letter Word Alert: (25 words)
elision, epsilon, hipness, insoles, ionises, iphones, isohels, isospin, lesions, lioness, lionise, loonies, loosens, oleosin, phenols, phonies, pinhole, pinless, pleions, plosion, poisons, siphons, spinels, spinose, splines