The word extermination 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 extermination
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Seven Letter Word Alert: (61 words)
airtime, anemone, arenite, axinite, axoneme, eminent, emirate, emitter, enamine, entrain, entrant, entreat, etaerio, examine, extrema, imitate, inertia, interim, intoner, ironman, iterate, martini, matinee, meatier, mention, minaret, miniate, mintier, montane, moraine, nattier, neonate, nitrate, nitrene, nitrite, nittier, nominee, nonamer, nonmate, nonmeat, omitter, onetime, otarine, raiment, reannex, remnant, romaine, teatime, tentier, termini, termite, ternate, tinnier, tintier, tonearm, torment, toxemia, trainee, triaene, triaxon, tritoma