The word extemporise 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: 24
Highest Scoring Words With Friends™ Plays In The Letters extemporise
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Seven Letter Word Alert: (51 words)
eeriest, emoters, empires, emptier, empties, epimers, episome, epitome, epoxies, erotise, exempts, experts, expires, exports, exposer, exposit, extirps, extreme, imports, imposer, isomere, meeters, meteors, metrise, moister, mopiest, mortise, permits, poetise, poxiest, preemie, premeet, premise, premixt, primost, promise, proxies, reemits, remeets, remixes, remotes, respite, retimes, ropiest, seepier, steeper, stomper, teemers, tempers, tempore, toprims