The word cornerbacks 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: 25
Highest Scoring Words With Friends™ Play In The Letters cornerbacks
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Seven Letter Word Alert: (38 words)
backers, bankers, barkers, barrens, beacons, beckons, bonkers, boranes, bracers, bracken, brokers, cancers, cankers, canoers, carbons, coakers, coarsen, coarser, conkers, corkers, corneas, corners, cracker, crakers, cranker, croaker, rackers, rancors, rankers, rebacks, reckons, recocks, recorks, reracks, rockers, scarcer, scorner, seacock