The word tetrodotoxins 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™ Play In The Letters tetrodotoxins
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Seven Letter Word Alert: (50 words)
dentist, detorts, dextrin, disroot, distort, dittoes, dotiest, dotters, dottier, editors, erosion, extorts, indoors, indorse, intorts, isodont, norites, orients, osteoid, retints, risotto, rodents, roisted, roosted, rosined, snooted, snorted, snotted, snotter, sootier, sortied, steroid, stinted, stonier, storied, tierods, tinders, tinters, titters, toonies, tooters, tootsie, tornote, toroids, torsion, totters, toxoids, trident, triones, trotted