The word rudbeckias 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™ Play In The Letters rudbeckias
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Seven Letter Word Alert: (35 words)
abduces, abiders, airbeds, ascribe, backers, beducks, bickers, braised, bricked, brisked, bruised, carbide, cruised, crusade, daubers, debarks, decarbs, dieback, duckers, duckier, duckies, duskier, radices, rebacks, redbuck, saucier, scabrid, scribed, seabird, sickbed, sidebar, sidecar, subrace, suckier, uricase