The word pasteurises 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™ Plays In The Letters pasteurises
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Seven Letter Word Alert: (68 words)
aeriest, asepses, asepsis, asperse, aspires, asserts, assures, austere, easiest, epurate, euaster, issuers, paresis, parties, passers, pasters, pastier, pasties, pasture, peatier, persist, peruses, pesters, pirates, praises, presets, presses, priests, purists, pussier, pussies, rapists, reissue, repaste, repasts, repeats, reseats, resists, respite, resteps, retapes, russets, sassier, satires, seaters, serapes, seriate, siestas, sisters, sparest, spireas, spriest, sprites, stripes, stupers, suiters, surpass, suspire, teasers, tissues, traipse, tresses, trusses, upraise, uprates, uprises, upstair, ureases