The word backsliders 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: 23
Highest Scoring Words With Friends™ Play In The Letters backsliders
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Seven Letter Word Alert: (86 words)
abiders, abscise, abseils, aidless, airbeds, airless, ascribe, backers, baldric, balkers, balkier, bedlars, bedrail, biassed, bickers, bilkers, blacked, blacker, blissed, brailed, braised, braises, braless, brassed, bricked, bridals, bridles, brisked, cablers, caliber, calibre, carbide, carless, classed, cradles, debarks, decarbs, declass, decrial, derails, dialers, dieback, disable, disbars, discase, eclairs, kaisers, kidless, lickers, radicel, radices, radicle, rebacks, reclads, reclass, redials, resails, ribless, sackers, saclike, sailers, scabies, scabrid, scalers, scalier, scleras, scribal, scribed, scribes, seabird, seasick, serials, sickbed, sickled, sickles, sidebar, sidecar, sidlers, skiable, skirled, slacked, slacker, slicers, slicked, slicker, sliders