Predator

A predator was an animal that naturally hunted and killed beings below it within a food chain.

The War Doctor, predator of the Daleks (PROSE: Engines of War)

The Seventh Doctor identified the Stigorax as "ruthless, intelligent predators." (TV: The Happiness Patrol)

"The Predator" was the Daleks' name for the the Doctor. (TV: Asylum of the Daleks)

The Eleventh Doctor identified the snowmen of the Great Intelligence as "mindless predators". (TV: The Snowmen)