The word attributively 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 attributively
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Seven Letter Word Alert: (40 words)
ability, abutter, attrite, battery, battier, battler, bilayer, biliary, bitrate, bittier, bravely, brevity, brittle, buttery, ilvaite, irately, liberty, ratbite, reality, rebuilt, rivulet, tartlet, tattier, tattler, tearily, terabit, tertial, titrate, titular, triable, tribute, trivial, uralite, utility, utterly, variety, vaulter, vibrate, virtual, vitiate