The word "exasperater" refers to a person or thing that causes annoyance, frustration, or anger. There are several synonyms for this word, including irritant, nuisance, provoker, aggravator, and vexer. An irritant is something that causes irritation or annoyance, such as a buzzing fly, while a nuisance is something or someone that causes inconvenience or annoyance, like a noisy neighbor. A provoker is someone who deliberately tries to provoke or annoy others, while an aggravator is something that makes a situation more irritating or frustrating. A vexer is someone or something that causes irritation or annoyance, especially through petty actions or comments. These synonyms can be used interchangeably to describe something that is causing frustration or annoyance.