The word prologises 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: 16
Highest Scoring Words With Friends™ Play In The Letters prologises
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Seven Letter Word Alert: (22 words)
epilogs, glioses, glories, glosser, goopier, goosier, goosies, gospels, lispers, loopier, lossier, orioles, poroses, porosis, prologs, regloss, regosol, resoils, respool, slopers, spoiler, spooler