it depends what kind
Organisms that eat other organisms are called consumers or predators.
Organisms that hunt and kill other organisms for food are called predators.
Organisms that secure food by eating other organisms are called consumers. They obtain nutrients by consuming other living organisms.
Parasites.
Decomposers.
Consumer
Ecology
An organism that obtains energy by feeding on other organisms is called a consumer or a heterotroph.
Animals that eat other organisms are called carnivores, or sometimes secondary consumers.
Those organisms are called heterotrophic. These organisms either eat the autotrophs (organisms that make their own food) or eat the organisms that eat the autotrophs (also called the producers). Heterotrophs are also called "consumers."
This group of organisms would be called a Community.
the organisms which depends on other organisms for their food are called Heterotrophs and this mode of nutrition is called Heterotrophic nutrition