The word prevaricator 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 prevaricator
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Seven Letter Word Alert: (32 words)
activer, aerator, airport, apricot, apteria, atropia, avarice, aviator, captive, carport, carrier, creator, ectopia, erotica, erratic, evictor, overact, overtip, picrate, pivoter, praetor, precoat, private, prorate, ratrace, reactor, repivot, tapioca, tarrier, terroir, vaporer, variate