polyonymy

/ˌpɑliˈɑnəmi/
noun
  1. The use of multiple names or titles for the same person or thing.
    • In literature, polyonymy can add depth to a character by giving them several epithets.
    • Polyonymy is common in religious texts, where a single deity is called by many names.
    • The study of polyonymy helps linguists understand how cultures categorize the world.