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

• tachygraphist
• tachygraphists
• tachygraphs
• tachygraphy
• tachylite
• tachylitic
• tachylyte
• tachylytes
• tachylytic
• tachymeter
• tachymeters
• tachymetric
• tachymetrical
• tachymetries
• tachymetry
• tachyon
• tachyons
• tachyphasia
• tachyphasias
• tachyphrasia
• tachyphrasias
• tachyphylaxis
• tachypnea
• tachypneas
• tachypnoea