The word mucopurulent 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: 26
Highest Scoring Words With Friends™ Play In The Letters mucopurulent
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Seven Letter Word Alert: (21 words)
cloture, clumper, compute, coulter, counter, coupler, couplet, couture, crumpet, crumple, culture, mounter, octuple, opulent, plouter, poulter, pouncer, punctum, recount, remount, trounce