The word workbenches 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™ Plays In The Letters workbenches
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Seven Letter Word Alert: (26 words)
beckons, benches, bewhore, bonkers, boreens, chewers, chokers, coheres, conkers, cowherb, echoers, encores, enrobes, herbose, knowers, necrose, nowhere, obscene, rechews, rechose, reckons, rehones, reshown, shocker, wenches, whereon