Other forms: captors
Someone who catches a person or animal and keeps them confined or imprisoned is a captor. Visiting the zoo, you might find yourself wondering if the lions see the zookeepers as friends or as captors.
The word captor sounds a little bit like capture, and it's no coincidence — they're both rooted in the Latin capere, "to take, hold, or seize." So if you capture a cricket and keep it in a little cage, you are its captor. And, when a police force captures a criminal and puts them in prison, the police become captors too. The original meaning of captor was actually "a censor."