An organism that kills and eats all or part of another is called a predator.

Here are some other related terms:

* Prey: The organism that is killed and eaten.

* Carnivore: An animal that eats other animals.

* Herbivore: An animal that eats plants.

* Omnivore: An animal that eats both plants and animals.

* Parasite: An organism that lives in or on another organism (the host) and benefits by deriving nutrients at the host's expense. Parasites don't always kill their hosts, but they can weaken them.

Let me know if you have any other questions!