Experiencer is a word commonly used to refer to people or things that have had an experience or have gone through a certain process. However, there are several synonyms that can be used in place of the word experiencer, depending on the context. The term participant is a common synonym, especially in situations where people are involved in an activity, such as sports. Another synonym for experiencer is subject, which is often used in research and experimental studies. Endurer, undergoer, and sufferer are other synonyms that can be used to describe someone who has gone through a challenging or unpleasant experience. Ultimately, the choice of synonym for experiencer depends on the nature of the experience or situation in question.