The word dangleberry 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
Seven Letter Word Alert: (51 words)
angered, barreed, beanery, belayed, belayer, blander, blarney, blender, brander, brangle, dangler, deanery, delayer, derange, dyeable, eagerly, enabled, enabler, enlarge, enraged, garbled, garbler, gardeny, general, gerbera, gleaned, gleaner, gnarled, gnarler, gnarred, grander, grandly, greenly, grenade, lagered, layered, learned, learner, legband, rebadge, rebaled, rebegan, reblend, rebrand, regrade, relayed, relayer, relearn, yearend, yearned, yearner