Rival is a word that can be used to describe a person or group that competes with another person or group. It can also be used to describe a person or group that is trying to defeat or be more successful than another person or group.
In the context of sports, rival can be used to describe two teams that compete against each other regularly. For example, the New York Yankees and the Boston Red Sox are rivals in Major League Baseball.
In the context of business, rival can be used to describe two companies that compete against each other for market share. For example, Coca-Cola and Pepsi are rivals in the soft drink industry.
Rival can also be used in a more general sense to describe any two people or groups that are competing against each other. For example, two students who are competing for the same scholarship could be considered rivals.