Predator

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

The Third Doctor identified the Tyrannosaurus rex as "the largest and fiercest predator of all time." (TV: Invasion of the Dinosaurs)

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)

River Song identified the Weeping Angels as predators. (TV: The Angels Take Manhattan)

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

The Thirteenth Doctor identified the Dregs of Orphan 55 as apex predators. (TV: Orphan 55)