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

• open town
• open towns
• open university
• open up
• open verdict
• open-weave
• openwork
• openworks
• opepe
• opepes
• opera
• operability
• operable
• opera bouffe
• opera buffa
• opera cloak
• opera cloaks
• opera-dancer
• opera-dancers
• plaquette
• plaquettes
• plash
• plashed
• plashes
• plashet