The word interminable 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: 21
Highest Scoring Words With Friends™ Play In The Letters interminable
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Seven Letter Word Alert: (63 words)
ailment, airline, airtime, aliment, ambient, aniline, arenite, balmier, beamlet, beermat, biennia, bimetal, bleater, eminent, emirate, enabler, enamine, enteral, entrain, eternal, inertia, interim, lantern, latrine, lenient, limiter, lineate, lineman, linemen, lintier, maltier, manlier, marlite, martini, matinee, mealier, meatier, melanin, militar, minaret, mineral, miniate, mintier, netmail, nimbler, nitrene, raiment, ratline, reblame, reblent, reliant, remnant, retinal, tenable, termini, timbale, timbrel, tinnier, trainee, tremble, trenail, triable, triaene