The word exterminator 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 exterminator
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Seven Letter Word Alert: (52 words)
arenite, armoire, attirer, axoneme, emirate, emitter, entreat, etaerio, examine, extrema, inerter, iterate, mariner, matinee, meatier, minaret, miterer, moraine, nattier, nitrate, omitter, onetime, ornater, otarine, raiment, rattier, reinter, remixer, remoter, retimer, retrain, retreat, romaine, tearier, teatime, tentier, termite, ternate, terrain, terrane, tonearm, torment, torrent, toxemia, trainee, trainer, traitor, treater, triaene, triaxon, trireme, tritoma