The word exterminates 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: 23
Highest Scoring Words With Friends™ Play In The Letters exterminates
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Seven Letter Word Alert: (97 words)
aeriest, antsier, arenite, artiest, artsmen, attires, earnest, eastern, eeriest, emirate, emitter, enemies, entreat, entrees, entries, examens, examine, extents, extrema, extreme, inmates, instate, iratest, itemset, iterate, marines, martens, martins, matinee, matters, meanest, meanies, meatier, meeters, metrise, metrist, minaret, minters, mittens, nastier, natters, nattier, nearest, neatest, netters, nitrate, raiment, reemits, remains, remates, remeets, remines, remints, remixes, renames, restain, restate, retains, retaste, retaxes, reteams, retimes, retinas, retints, seamier, seminar, seriate, seriema, sextain, sextant, sirname, sixteen, smarten, smartie, smatter, smitten, stainer, steamer, sterane, straint, striate, tastier, teatime, teemers, teenier, teeters, tenters, tentier, termite, ternate, testier, texters, tinters, trainee, transit, triaene, trienes