The word neurotoxins 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: 21
Highest Scoring Words With Friends™ Play In The Letters neurotoxins
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Seven Letter Word Alert: (35 words)
erosion, interns, intoner, intones, introns, inturns, ionones, neurons, neutron, nitrous, nonriot, nonsuit, nonuser, norites, notions, noxious, nutsier, onerous, orients, reunion, riotous, routine, sootier, stonier, stourie, stunner, sunnier, tension, tinners, tonsure, toonies, torsion, triones, uniters, unrisen