The word ethosuximides 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: 27
Highest Scoring Words With Friends™ Play In The Letters ethosuximides
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Seven Letter Word Alert: (52 words)
deities, demises, demists, demotes, detoxes, dieties, ethmoid, exhumed, exhumes, existed, heisted, hessite, hideous, hideout, hoisted, homiest, humites, iodises, iodisms, iodites, isthmus, itemise, meioses, meiosis, methods, misdoes, misedit, missuit, misused, mitoses, mitosis, moussed, mouthed, outsees, outside, oxhides, oxidise, sexiest, shouted, sixties, sodiums, somites, stimied, stimies, stomies, studies, studios, tedious, tediums, theisms, tissued, tuxedos