exile vs refoulement

exile

noun
  • The state of being banished from one's home or country. 

  • Someone who is banished from their home or country. 

verb
  • To send (someone or something) into exile. 

refoulement

noun
  • Rendition of a person to an area (chiefly their country of origin) where they will face mistreatment, for example, expulsion of refugees into a war zone; (countable) an instance of this. 

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