The word bottlebrush 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 bottlebrush
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Seven Letter Word Alert: (40 words)
betroth, blotter, blusher, bluster, bolster, bolters, bothers, bottler, bottles, brothel, burbles, bustler, butlers, butters, elutors, herbous, hobbler, hobbles, holster, hostler, hottubs, hurtles, lobbers, lobster, obtuser, outbets, outlets, rubbles, setbolt, shouter, shutter, shuttle, slobber, stouter, stubble, subtler, touters, trouble, turbots, turtles