What term refers to a carnivore that feeds on other carnivores?

The term that refers to a carnivore that feeds on other carnivores is tertiary consumer. In ecological terms, a tertiary consumer occupies a position in the food chain that is typically above secondary consumers, which are often carnivores that primarily eat herbivores (primary consumers).

Tertiary consumers are usually at the top of the food chain and represent higher trophic levels where energy transfer is less efficient due to energy loss at each step. This means they consume other carnivores to gain the energy and nutrients necessary for survival. In many ecosystems, tertiary consumers can include apex predators, which are at the highest level of the trophic hierarchy and have few or no natural enemies.

The other choices represent different roles in the ecosystem: primary consumers are herbivores that consume plants, while secondary consumers are typically carnivores that eat primary consumers (herbivores). Quaternary consumers are even higher on the food chain than tertiary consumers and can sometimes also include carnivores that prey on tertiary consumers. However, for the specific definition asked in this question, tertiary consumer is the most accurate term.