The word nonequivalent 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: 31
Highest Scoring Words With Friends™ Play In The Letters nonequivalent
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Seven Letter Word Alert: (28 words)
aliquot, annulet, antique, antlion, elation, elative, elution, enliven, enolate, lenient, lineate, neonate, nonevil, nonlate, outline, outlive, ovulate, quieten, quinone, tequila, toenail, toluene, uneaten, veinlet, veinule, vinelet, violate, violent