The word interminably 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 interminably
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Seven Letter Word Alert: (61 words)
ability, ailment, airline, airtime, aliment, ambient, amenity, aniline, anytime, bairnly, balmier, biennia, bilayer, biliary, bimetal, blarney, byliner, entrain, inanely, inertia, inertly, inlayer, interim, irately, lantern, latrine, laytime, liberty, limiter, lineman, lintier, maltier, manlier, marlite, martini, meatily, melanin, militar, minaret, mineral, miniate, mintier, netmail, nimbler, raiment, ratline, reality, reliant, remnant, retinal, tannery, tearily, tenably, termini, timbale, timbrel, tinnier, tinnily, trembly, trenail, triable