The word backpedaling 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: 30
Highest Scoring Words With Friends™ Plays In The Letters backpedaling
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Seven Letter Word Alert: (54 words)
aligned, angelic, backend, backing, baglike, balance, balding, balking, bandage, beading, bedclip, bipedal, biplane, blacked, blacken, blanked, blinked, cabling, cakepan, candela, capable, clanged, clanked, clinked, dealign, dealing, decalin, decking, dieback, glanced, inplace, kelping, lacking, leading, leaking, leaping, legband, linkage, package, packing, pancake, panicle, peaking, pealing, pecking, pelagic, pelican, pickled, piebald, pingled, placing, planked, plebian, plinked