bonanza /bə-nanˈzə or bəʊ- or bo-/

1. A rich mine or vein of precious ore (N American)
2. A large amount of (usu) silver
3. Any source of wealth or stroke of luck

Very prosperous

• operand
• operands
• operant
• operant conditioning
• operants
• operas
• opera seria
• opera singer
• opera singers
• operate
• operated
• operates
• operatic
• operatically
• operating
• operating room
• operating rooms
• operating system
• operating systems
• operating table
• operating tables
• operating theatre
• operating theatres
• operation
• operational