Notifiers are defined as individuals or tools that inform or alert someone about a particular event or situation. However, there are various words that can be used interchangeably with 'notifiers' depending on the context and situation. Some synonyms for notifiers include communicators, informants, reporters, announcers, heralds, messengers, or conveyors. These words can be used to refer to both human and non-human notifiers such as applications, software, or machines designed to notify users of events or activities. In summary, knowing different words that can be used instead of notifiers can enhance communication efficiency and make it easier to describe particular situations.