The word megakaryocytes 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: 30
Highest Scoring Words With Friends™ Play In The Letters megakaryocytes
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Seven Letter Word Alert: (79 words)
acaters, acatery, acerate, acerose, acreage, aerates, agamete, agarose, amerces, caeomas, cameras, cargoes, cartage, caseate, cerates, coakers, coaster, corkage, corsage, creates, cremate, cystoma, cytomas, eartags, emoters, gametes, gearset, goatees, grayest, greyest, gyrates, keyseat, maestro, margate, markets, mastery, meerkat, meteors, mockers, mockery, myocyte, mystery, oatcake, octamer, racemes, rackets, recoats, remakes, remates, remotes, restack, restage, restake, restock, restoke, retacks, retakes, reteams, rockets, rosacea, roseate, sarcoma, scatoma, screamy, seagoer, smacker, soakage, sockeye, stacker, steamer, stocker, storage, streaky, streamy, tackers, tarmacs, teacake, teargas, tyromas