There are several synonyms for the word "tryer-out" that can be used to describe someone who experiments or tests a product or idea. One option is "evaluator", which refers to someone who assesses the quality or effectiveness of something. Another alternative is "experimenter", which suggests a willingness to test different approaches in order to achieve a goal. Some other options might include "tester", "researcher", "explorer", or "investigator". Ultimately, the choice of synonym will depend on the context and tone of the communication. However, all of these options convey a sense of someone who is actively engaged in the pursuit of knowledge or improvement.