A real world test is a crucial evaluation method to determine the performance of a product or system in practical and realistic situations. However, if you want to avoid repetition and diversify your language, there are several synonyms that you can use to substitute this term. For instance, you can say "field test," "on-site trial," "practical examination," or "live assessment." Other alternatives include "actual experimentation," "empirical study," "authentic assessment," or simply "realistic analysis." Regardless of the term you use, the main goal is to convey that the product or system is being tested in real-life scenarios to ensure its reliability and effectiveness.