The word backgrounder 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 backgrounder
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Seven Letter Word Alert: (62 words)
adorner, aground, arbored, backend, barcode, bedrock, boarder, bondage, bounced, bouncer, bounder, bracken, brander, branked, broaden, broader, brocade, burgeon, cordage, corkage, courage, cranked, cranker, croaked, croaker, crunode, decagon, dockage, drunker, geoduck, gnarred, goburra, grander, groaned, groaner, guarder, guerdon, gurnard, knarred, knurred, oranger, rancour, readorn, reboard, rebound, rebrand, redbuck, roebuck, rongeur, rounder, runback, unbaked, unboard, unbrace, unbrake, unbroke, uncaged, uncaked, uncared, uncored, undergo, unrobed