The word neutrophil 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 neutrophil
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Seven Letter Word Alert: (30 words)
elution, hoplite, hotline, luthier, opulent, outhire, outlier, outline, philter, philtre, phonier, pinhole, plouter, pointer, politer, poulter, poutier, poutine, proline, protein, purloin, reinput, repilot, repoint, retinol, routine, topline, tripole, unipole, urolith