The word backslider 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: 22
Highest Scoring Words With Friends™ Play In The Letters backslider
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Seven Letter Word Alert: (55 words)
abiders, airbeds, ascribe, backers, baldric, balkers, balkier, bedlars, bedrail, bickers, bilkers, blacked, blacker, brailed, braised, bricked, bridals, bridles, brisked, cablers, caliber, calibre, carbide, cradles, debarks, decarbs, decrial, derails, dialers, dieback, disable, eclairs, lickers, radicel, radices, radicle, rebacks, reclads, redials, saclike, scabrid, scalier, scribal, scribed, seabird, sickbed, sickled, sidebar, sidecar, skiable, skirled, slacked, slacker, slicked, slicker