The word inbreedings 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: 19
Highest Scoring Words With Friends™ Play In The Letters inbreedings
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Seven Letter Word Alert: (35 words)
benders, bendier, bending, binders, binding, bingers, birdies, birding, bridges, deniers, derbies, dingier, dingies, dinners, ebriids, endings, engined, engines, genders, greisen, grinned, inbreds, inbreed, insider, needing, rebegin, rebinds, reigned, reining, rending, ridings, rinsing, sedgier, seeding, sending