The word tranquillise 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: 25
Highest Scoring Words With Friends™ Play In The Letters tranquillise
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Seven Letter Word Alert: (88 words)
airiest, airline, allures, antique, antlers, antsier, arillus, aunties, elastin, eluants, entails, estrual, illites, inertia, inquest, inquiet, inquire, install, instill, insular, inulase, irisate, latrine, laurels, lentils, lintels, lintier, literal, lunates, luniest, lustier, nailers, nailset, nastier, natures, neutral, nutsier, qintars, querist, quiller, quillet, quilter, rallies, ratline, realist, reliant, renails, rentals, reslant, restain, retails, retains, retills, retinal, retinas, rillets, rituals, rutiles, salient, saltern, saltier, saluter, saunter, siliqua, silique, sillier, siltier, sinuate, slatier, stainer, stellar, sternal, stiller, tallier, tallies, tequila, tillers, trellis, trenail, unalert, unalter, uniters, unities, uralite, urinals, urinate, utensil, utilise