The word lumberjacks 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: 35
Highest Scoring Words With Friends™ Play In The Letters lumberjacks
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Seven Letter Word Alert: (38 words)
abjures, amblers, backers, balkers, becurls, bemauls, blacker, blamers, buckler, buckles, cablers, cambers, caulker, clamber, crumble, curable, embarks, jumbler, jumbles, lumbers, mackles, macules, marbles, maulers, muckers, rambles, rebacks, recaulk, recusal, rumbles, sculker, secular, serumal, slacker, slumber, smacker, subrace, suckler