The word "Discipliner" refers to a person or tool that imposes discipline on someone or something. There are many synonyms that can be used to express the same idea. Some of the synonyms for "Discipliner" include enforcer, regulator, controller, chastiser, punisher, and corrector. Each of these words implies the act of controlling or regulating behavior, possibly through punishment or correction. Other similar words may include overseer, supervisor, manager, instructor, and leader. It is important to choose the right synonym depending on the context of the sentence or situation to convey the intended meaning accurately.