The word thunderbirds 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 thunderbirds
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Seven Letter Word Alert: (76 words)
bedirts, bestrid, bidders, binders, birders, birthed, bruised, bruiser, brushed, brusher, brutish, budders, buddies, burdens, burners, burnish, bushier, bustier, deburrs, distend, disturb, dithers, druther, dunites, dustbin, dustier, herbist, hinders, hirsute, hundred, hunters, hurried, hurries, hurters, inbreds, insured, insurer, intrude, nutsier, rebinds, rebirth, rebrush, reburns, reburst, reddish, returns, rudders, ruddier, ruddies, rudites, runtier, rustier, shirted, shrined, shudder, shunted, shunter, stirred, strider, studied, studier, subedit, suberin, subtend, sunbird, thunder, tinders, tribune, turbine, turners, turrids, undrest, undried, uniters, untired, untried