Intriguing & Unusual:
* Bumbershoot: A stylish umbrella, often with a dome shape.
* Balderdash: Nonsense, gibberish, or something utterly absurd.
* Bumbershoot: An old-fashioned word for a large, dome-shaped umbrella.
* Blighty: A slang term for England or the UK, often used by British soldiers during WWI.
* Bally: An informal British word used to add emphasis or humor to a sentence, similar to "bloody."
* Bogus: Fake, counterfeit, or not genuine.
* Bung: A stopper or plug, especially for a bottle or barrel.
* Brainstorm: To think of ideas in a spontaneous, often chaotic way.
* Blarney: The art of charming or flattering someone, often to gain something.
Nature & Science:
* Biosphere: The parts of Earth that support life, including the atmosphere, land, and water.
* Biome: A large community of plants and animals that share a particular climate.
* Baffin: A large island in the Canadian Arctic, known for its harsh climate and stunning landscapes.
* Bioluminescence: The production of light by living organisms, like fireflies and jellyfish.
* Bongo: A type of large, African antelope known for its beautiful horns.
Other:
* Boss: A person in a position of authority or leadership.
* Beguile: To charm or enchant someone.
* Bask: To relax and enjoy warmth, often in the sun.
* Breakneck: Extremely fast or dangerous.
* Brisk: Energetic and lively.
* Braggart: Someone who boasts excessively.
* Bucolic: Relating to the countryside, rural, or idyllic.
* Bon vivant: A person who enjoys a luxurious and pleasure-seeking lifestyle.
Bonus:
* Banjo: A musical instrument with a resonating body, a long neck, and strings.
* Belladonna: A poisonous plant with beautiful flowers, also known as deadly nightshade.
This is just a small sample of the many cool words that start with "b." The best choice will depend on the context and the specific effect you're trying to achieve.