Carnivore means Meat (carni-) eater (-vore). It may refer to order of animals known as the carnivora, which includes cats, dogs, bears, otters, seals and minks, among many others. Many of these animals are actually classified as omnivores when referring to their dietary habits.
Otherwise 'carnivores' are simply animals who eat primarily meat. These animals are either at the top of the food chain or are parasites. Carnivores include predators and scavengers, and includes members of nearly every order of Animalia. There are also carnivorous plants, such as the Venus fly trap and the pitcher plant.