The word backbenchers 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: 31
Highest Scoring Words With Friends™ Plays In The Letters backbenchers
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Seven Letter Word Alert: (35 words)
absence, achenes, arsheen, backers, bankers, banshee, beaches, beakers, benches, bracken, cachers, cancers, cankers, carbeen, carbene, careens, chances, chancre, checker, creches, hackers, hankers, harkens, hasbeen, hearken, ranches, reaches, rebacks, rebakes, recache, recanes, recheck, reshake, screech, sneaker