The word extrasystole 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: 22
Highest Scoring Words With Friends™ Plays In The Letters extrasystole
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Seven Letter Word Alert: (83 words)
areoles, artless, earless, elaters, essayer, estates, exalter, extoler, extorts, lassoer, leasers, letters, lottery, lysates, oarless, oleates, osselet, ostlers, oxysalt, oysters, rattles, rayless, realest, relates, relaxes, resales, reseals, reseats, resoles, restate, restyle, retaste, retaxes, retests, retoast, retotal, roseate, roselet, rosette, rotates, sealers, seaters, setters, settler, settles, sextets, slaters, slayers, sortals, stalest, starlet, startle, stately, staters, stayers, stealer, stereos, sterols, storeys, streets, stylate, stylers, stylets, systole, tasters, taxless, tealess, teasels, teasers, teleost, tersely, tersest, testers, texters, toaster, toeless, toyless, trestle, tyloses, tylotes, xeroses, xyloses, xysters