The word exterminable 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: 27
Highest Scoring Words With Friends™ Play In The Letters exterminable
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Seven Letter Word Alert: (50 words)
ailment, aliment, ambient, arenite, balmier, beamlet, beeline, beermat, bimetal, bleater, element, elixate, emirate, enabler, enteral, eternal, exalter, examine, extrema, extreme, latrine, lineate, maltier, manlier, marlite, matinee, mealier, meatier, minaret, mineral, mixable, netmail, nimbler, raiment, ratline, reblame, reblent, relaxin, reliant, retinal, teenier, tenable, timbale, timbrel, trainee, tremble, trenail, triable, triaene, triaxle