The word backwardness 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: 27
Highest Scoring Words With Friends™ Play In The Letters backwardness
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Seven Letter Word Alert: (44 words)
abasers, abrades, abrased, abrases, ancress, answers, arcades, ascends, awakens, backend, backers, backsaw, badness, bankers, bracken, branked, brassed, canards, cankers, cranked, dancers, darkens, debarks, decarbs, ransack, rawness, rebacks, resands, rescans, sackers, sandbar, sanders, sawback, scarabs, seabank, seaward, snacked, snarked, swanked, swanker, wanders, wardens, weasand, wracked