The word meadowlarks 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: 23
Highest Scoring Words With Friends™ Play In The Letters meadowlarks
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Seven Letter Word Alert: (23 words)
alamode, alarmed, areolas, armload, demarks, deworms, earldom, earmold, loaders, malware, meadows, molders, morales, ordeals, radomes, reloads, remolds, rewalks, seaward, seaworm, smolder, swarmed, walkers