The word "coronion" does not exist in the English language, so there are no synonyms for it. It's possible that the intended word might be "coronation," which means the act of crowning a monarch or other ruler. Synonyms for "coronation" include investiture, enthronement, and crowning. However, if the intended word is some variation on "coronavirus," then synonyms might include COVID-19, SARS-CoV-2, or pandemic disease. It's important to use accurate terminology when discussing medical conditions and other topics, in order to avoid confusion and promote clarity.