The word unburnished 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 unburnished
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Seven Letter Word Alert: (25 words)
binders, bruised, brushed, bunnies, burdens, burnish, bushier, dinners, hinders, inbreds, insured, rebinds, shinned, shrined, shunned, shunner, subduer, suberin, sunbird, sunburn, sunnier, unbends, unbinds, undines, unrisen