emigre vs transmigration

emigre

noun
  • An emigrant, one who departs their native land to become an immigrant in another. 

  • One who has departed their native land, often as a refugee. 

transmigration

noun
  • Departure from one's homeland to live in another country; migration. 

  • The movement of a soul from one body to another after death; metempsychosis. 

  • A change from one state of existence to another. 

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