What is another word for cash cow?
Pronunciation: [kˈaʃ kˈa͡ʊ] (IPA) 
Cash cow is a common figure of speech used in business and finance to describe a product, service, or investment that generates a steady and substantial stream of revenue. However, there are other synonymous terms that can be used instead of "cash cow" such as breadwinner, dependable income producer, profit center, reliable earner, revenue booster, and golden goose. These synonyms all imply the same concept of a strong and consistent source of income, which is valuable to businesses and investors alike. Whatever term is used to describe them, the financial success that cash cows provide is essential to the longevity and growth of any enterprise.
