noun

• Boko Haram
• Abbreviation of Bihar, a state in India. [A state in eastern India. Capital: Patna.]
• Initialism of heavy battleship.
• Initialism of bank holiday. [(UK, Ireland) A weekday, often a Monday, on which most businesses are closed, and granted to workers as a national holiday.]
• (knitting) Initialism of buttonhole. [A hole through which a button is pushed to secure a garment or some part of one.]
• (astronomy) Initialism of black hole. [A place of punitive confinement; a lockup or cell; a military guardroom.]