The word peristalsis 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: 15
Highest Scoring Words With Friends™ Play In The Letters peristalsis
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Seven Letter Word Alert: (68 words)
airiest, airless, aplites, artless, asepsis, aspires, asserts, irisate, lassies, liaises, lipases, lispers, palsies, palters, paresis, parties, passers, pastels, pasters, pastier, pasties, persist, piarist, pilates, pirates, pissier, pistils, pitiers, pitless, plaster, platers, praises, priests, rapists, realist, relists, repasts, replait, resails, resists, resplit, retails, sailers, saltier, sapless, sassier, satires, serials, siestas, siltier, sissier, sisters, slaters, slatier, sparest, spirals, spireas, spirits, spriest, sprites, stapler, staples, stripes, tassels, tipless, tipsier, traipse, triples