What are two nominal rates called when they are equal?

When two nominal rates are equal, they are referred to as the equivalent nominal rate. This term is critical in finance and economics, as it helps in comparing different financial instruments or investments that may have different compounding intervals or account for different levels of risk. The concept of an equivalent nominal rate allows for a straightforward comparison and analysis of these rates, facilitating better financial decision-making.

In contrast, other terms such as absolute rate, equal nominal rate, and congruent nominal rate do not carry the same established meaning within the field of finance. While they may appear similar, they do not specifically denote the relationship between equal nominal interest rates. The term "equivalent nominal rate" is widely recognized and used, making it the correct choice in this context.