The word culpableness 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: 25
Highest Scoring Words With Friends™ Play In The Letters culpableness
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Seven Letter Word Alert: (50 words)
absence, alecups, alpeens, baleens, ballpen, because, bluecap, bullpen, capless, capsule, clauses, cleanse, cleanup, cubanes, cubless, cueball, cupless, elapses, enables, enbuses, encases, enclasp, enseals, escapes, euclase, eupneas, napless, nebulae, nebulas, pencase, pleases, punless, scalene, scalpel, seances, sensual, specula, spelean, spleens, subcase, subcell, unbales, unbless, uncapes, unclasp, unlaces, unseals, unspell, upscale, useable