The word corncrakes 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: 21
Highest Scoring Words With Friends™ Play In The Letters corncrakes
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Seven Letter Word Alert: (25 words)
cancers, cankers, canoers, coakers, coarsen, coarser, conkers, corkers, corneas, corners, cracker, crakers, cranker, croaker, rackers, rancors, rankers, reckons, recocks, recorks, reracks, rockers, scarcer, scorner, seacock