General terms:
* Consumers: This is a broad term used in ecology to describe organisms that obtain their food by consuming other organisms.
* Organoheterotrophs: This term emphasizes the fact that heterotrophs obtain their carbon from organic sources.
* Phagotrophs: This term specifically refers to heterotrophs that consume food particles by engulfing them, like animals do.
* Saprotrophs: This term refers to heterotrophs that obtain nutrients by decomposing dead organic matter, like fungi and some bacteria.
More specific terms:
* Carnivores: Organisms that consume only meat.
* Herbivores: Organisms that consume only plants.
* Omnivores: Organisms that consume both plants and animals.
* Parasites: Organisms that live in or on another organism and obtain nutrients from their host.
The best word to use will depend on the specific context and what you are trying to emphasize.