The word thrombocytes 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: 25
Highest Scoring Words With Friends™ Play In The Letters thrombocytes
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Seven Letter Word Alert: (43 words)
betroth, boomers, booster, booters, borscht, botcher, botches, bothers, bottoms, boycott, chooser, chromes, cohorts, combers, corymbs, cotters, coyotes, embryos, hombres, mobster, moocher, mooches, mothers, mottoes, october, oocytes, otocyst, reboost, reboots, recombs, reshoot, scooter, scyther, shooter, smoochy, smoothy, smother, soother, stretch, thermos, tomboys, tooters, torches