The word borderlines 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: 17
Highest Scoring Words With Friends™ Plays In The Letters borderlines
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Seven Letter Word Alert: (68 words)
bedsore, benders, bendier, berried, berries, binders, binodes, birders, blender, blinder, blonder, blondes, boilers, bolides, borders, boreens, bridler, bridles, brindle, broiled, broiler, deboner, debones, deniers, denoise, derbies, dernier, derries, desirer, disrobe, ebonies, edibles, eloined, endorse, enrobed, enrober, enrobes, inbreds, inbreed, indoles, indorse, ironers, lenders, linseed, lorries, nerdier, oilseed, rebinds, reblend, reboils, rebonds, rebored, rebores, redline, redries, reliers, relined, relines, renders, reoiled, rerinse, resider, resoled, rosined, slender, sobered, soberer, soldier