Yes, feed on small animals and fruit and leaves, and are preyed on my many predators.
Monkeys are omniverous, and sometimes eat smaller animals. Monkeys are also prey to many predators, big cats, birds of prey, among others. So they are both.
Depends on what oposing animal you are basing the question.
in the zoo, they are the predator... but they CAN be both int the wilda monkey is usually a prey that is eaten by bigger animals
they are in the middle