The word extraterrestrial cannot be made in Words With Friends™. It is 16 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters extraterrestrial
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Seven Letter Word Alert: (107 words)
aerates, aerials, aeriest, alerter, arrears, artiest, artsier, atresia, attelet, attirer, attires, attrist, attrite, earlier, eeriest, elaters, elixate, exalter, iratest, iterate, lariats, latites, leerier, letters, litters, rattail, ratters, rattier, rattler, rattles, realers, realest, realise, realist, realter, rearise, reelers, relater, relates, relaxer, relaxes, release, reliers, restart, restate, retails, retaste, retaxes, retears, retiles, retilts, retiree, retirer, retires, retitle, retreat, retrees, retrial, retries, saltate, saltier, satiate, seriate, serrate, settler, sextile, slatier, slitter, starlet, starlit, starter, startle, stealer, steelie, steerer, sterile, stilter, stirrer, striate, tarrier, tarries, tartars, tartest, tartlet, tastier, tatters, tattier, tattler, tattles, tearers, tearier, teeters, telexes, terrier, tertial, testate, testier, texters, textile, tilters, titrate, titters, trailer, treater, treelet, trestle, triaxle