The word expostulate 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: 23
Highest Scoring Words With Friends™ Plays In The Letters expostulate
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Seven Letter Word Alert: (26 words)
apostle, auletes, eluates, epaulet, estuate, exposal, expulse, luxates, oleates, outlast, outleap, outlets, outstep, palette, peltate, poleaxe, pottles, pulsate, sealpox, septate, teapots, teleost, textual, toluate, toupees, upstate