emigration vs metempsychosis

emigration

noun
  • A body of emigrants; emigrants collectively. 

  • The act of emigrating; movement of a person or persons out of a country or national region, for the purpose of permanent relocation of residence. 

metempsychosis

noun
  • Transmigration of the soul, especially its reincarnation after death. 

How often have the words emigration and metempsychosis occurred in a corpus of books? (source: Google Ngram Viewer )