Displeaser is a negative term that refers to someone or something that causes dissatisfaction, annoyance, or discontent. There are several synonyms that can be used in place of the word displeaser, including irritant, nuisance, bother, vexation, annoyance, inconvenience, and agitation. These words all have the same basic meaning as displeaser, but they may differ slightly in their connotations or the situations in which they are most appropriate. For example, nuisance is often used to describe something that is more minor or persistent, while irritant suggests something that is more acute or irritating. Regardless of the word used, all of these synonyms convey the idea of something or someone that is causing frustration or annoyance.