There are several synonyms for the word "irritator," including agitator, annoyer, vexer, provoker, pest, troublemaker, and antagonist. An irritator is someone or something that causes annoyance or frustration, and these synonyms all convey a similar meaning. An agitator is someone who intentionally stirs up trouble or discord, while an annoyer is someone who repeatedly irritates or bothers others. Vexers and provokers similarly cause frustration and annoyance, while pests can be a nuisance and an irritation for others. The term troublemaker can refer to someone who intentionally causes problems or difficulties for others, while an antagonist is someone who creates conflict or opposition.