The word peristyles 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 peristyles
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Seven Letter Word Alert: (45 words)
epistle, eyepits, eyeslit, lispers, lyrists, pelites, pelters, perlite, persist, pesters, pestles, petless, petrels, pieless, pitless, presets, priests, pyrites, relists, repiles, replies, reptile, respelt, respite, resplit, resteps, restyle, retiles, retypes, spriest, sprites, spryest, steeply, sterile, stripes, stripey, stylers, stylier, stylise, tersely, tieless, tipless, triples, yelpers, yperite