The word dibranchiate 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: 22
Highest Scoring Words With Friends™ Plays In The Letters dibranchiate
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Seven Letter Word Alert: (65 words)
abreact, airdate, airhead, antacid, archean, bartend, batched, benthic, birched, birthed, brachia, bracted, brained, breadth, cabaret, cabinet, cairned, cantred, carbide, carbine, carinae, catbird, cathead, certain, chained, chainer, chaired, chanted, chanter, charade, charted, cithern, citrine, decabit, denarii, detrain, ditcher, echidna, hairnet, handcar, handier, hatband, ichnite, incited, inciter, inditer, inertia, inhabit, inherit, inreach, itchier, nitride, radiant, radiate, rainhat, ranched, rebatch, rechain, tiaraed, trachea, tradein, trained, tranced, tranche, triadic