The word bestridden 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: 16
Highest Scoring Words With Friends™ Play In The Letters bestridden
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Seven Letter Word Alert: (39 words)
bedders, bedirts, bedrest, bedside, benders, bendier, bestrid, betided, betides, bidders, binders, debited, debride, deniers, derbies, derides, desired, destine, detrend, diester, dieters, distend, dresden, entries, inbreds, inbreed, rebinds, rebited, rebites, reddens, reddest, reedits, resided, sterned, teddies, tenders, tinders, trended, trienes