The word externalizes 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: 30
Highest Scoring Words With Friends™ Play In The Letters externalizes
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Seven Letter Word Alert: (79 words)
aeriest, antlers, antsier, arenite, earnest, eastern, eeriest, elastin, elaters, elixate, entails, enteral, entrees, entries, eternal, exalter, lateens, latrine, laziest, leaners, leanest, lenites, lineate, nailers, nailset, nastier, nearest, ratline, realest, realise, realist, realize, relates, relaxes, relaxin, release, relents, reliant, relines, renails, rentals, reseize, reslant, restain, retails, retains, retaxes, retiles, retinal, retinas, salient, saltern, saltier, seltzer, seriate, sextain, sextile, sixteen, slatier, sneezer, stainer, stealer, steelie, sterane, sterile, sternal, teazels, teazles, teenier, telexes, tensile, trainee, trenail, triaene, triaxle, trienes, zaniest, zeatins, zestier