moneymaker UK US (also money-maker) /ˈmʌniˌmeɪkər/ noun [C] FINANCE
► a product, service, business, or activity that makes a profit: »
The product is the company's big moneymaker.
► a person who is good at making money: »
He is a partner in the company and their only real moneymaker.
Financial and business terms. 2012.