Show stopper is a term used for something or someone that is so impressive or captivating that it stops the show. There are several synonyms for this term, and they include game-changer, crowd-pleaser, head-turner, attention-grabber, show-stunner, and wow factor. These synonyms can be used in various contexts to describe different situations. For instance, a game-changer may refer to someone or something that alters the course of events, while a crowd-pleaser is someone or something that entertains the audience. An attention-grabber is someone or something that draws attention, while a show-stunner is something that leaves the audience stunned. In essence, these synonyms capture the essence of a show stopper and can be used interchangeably.