The noun predator means an animal that slay and devour other beings, such as a prey, in order to live.

Synonyms are hunter, killer, meat eater, or beast of prey.

The word origins from Latin (1862) praedator meaning “plunderer”. It comes from praedari meaning “to rob”. It is originally Predatores (1840) used of insects that ate other insects.

The predator eyed his prey and prepared for the kill.

I watched the movie where aliens were predators who try to kill humans and eat them.

Wolves are one of the main predators of small mammals.