There are several synonyms for the phrase "prosperous industry," including successful sector, thriving business, profitable trade, booming economy, flourishing commerce and thriving market. Each of these synonyms refers to a sector that is doing well, experiencing growth and generating revenue. They can be used to describe a variety of industries, from technology and finance to fashion and hospitality. The use of these synonyms can help to add variety and depth to writing and enhance the description of a particular industry or sector. They are all great options to use when trying to convey the success and growth of a particular business or industry.