Nouns

(n)repeatera person who repeats“the audience consisted largely of repeaters who had seen the movie many times”
(n)recidivist, repeater, habitual criminalsomeone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior)
(n)repeating firearm, repeatera firearm that can fire several rounds without reloading
(n)repeater(electronics) electronic device that amplifies a signal before transmitting it again“repeaters can be used in computer networks to extend cabling distances”