Repeater

автоматична пушка

avtomatična puška

(a gun that has a store of cartridges and does not need reloading after each shot)

повтаряч

povtarjač

(a student repeating a course or class)

повторител

povtoritel

(electronics: an electronic device that received a weak or low-level signal and retransmits it at a higher level or power)