Metamorphoser is a term used to describe a person who undergoes transformation or change. There are a number of synonyms that can be used to describe this term, such as shape-shifter, transformer, convert, transmute, mutate, and evolve. All of these words imply a change in form or nature, which is the essence of metamorphoser. Another term that can be used interchangeably with metamorphoser is chameleon, as it embodies the idea of adapting to new circumstances and environments. Overall, these synonyms capture the essence of personal transformation and the many ways in which people can change and evolve throughout their lives.