deportation vs expatriation

deportation

noun
  • The act of deporting or exiling, or the state of being deported; banishment; transportation. 

expatriation

noun
  • forced expulsion of from one's native land to another 

  • voluntary migration from one's native land to another 

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