What term refers to a powerful or influential person, especially in business?

The term that refers to a powerful or influential person, especially in the context of business, is "magnate." This word is often used to describe individuals who have amassed significant wealth or power in a particular industry or sector, such as a media magnate or a real estate magnate. These individuals typically have a substantial impact on their fields and can influence market trends, policies, and practices due to their resources and status.

In contrast, "novice" denotes someone who is new or inexperienced in a particular area, which does not align with the concept of influence or power. "Leader" might suggest someone in charge or guiding a team, but it lacks the specific connotation of substantial business influence characteristic of a magnate. "Employee" simply refers to someone working for an organization, without implying any significant power or influence in a business context.