The word unattributable 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: 24
Highest Scoring Words With Friends™ Play In The Letters unattributable
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Seven Letter Word Alert: (58 words)
abettal, abluent, abuttal, abutter, airable, attrite, banaler, barbule, battier, battler, bitrate, blatant, blunter, brittle, labiate, latrine, lunaria, nattier, natural, nebular, neurula, neutral, nibbler, nitrate, nubbier, nuttier, ratbite, ratline, rattail, rebuilt, reliant, retinal, tabinet, tableau, tabular, tartlet, tattier, tattler, taunter, terabit, tertial, titrate, titular, trenail, triable, tribune, tribute, tubbier, tubular, tubulin, tunable, turbine, unabate, unalert, unalter, unbuilt, uralite, urinate