A word meaning interaction in which one organism kills and eats another is carnivore. Carnivorous is a classification of animal often used to describe mammals that eat meat.
Commensalism
cannibalism
food chain
it is called predation.
Such interaction is known as predator-prey relationship for example relation of a Gazelle and a Lion.
predation
An organism that kills and eats all or part of another organism is called a carnivore.
carnivores
This interaction is called predation.
that would technically be classified as a predator.
predator-prey relationship
predator - prey relationship