The word reticulocyte 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™ Plays In The Letters reticulocyte
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Seven Letter Word Alert: (26 words)
circlet, clitter, clotter, cloture, clutter, coterie, coulter, courtly, cruelty, culotte, curette, cuticle, cutlery, elector, elocute, erectly, lecture, lettuce, leucite, lottery, outlier, recycle, retitle, tutoree, tutorly, utterly