lustration vs repression

lustration

noun
  • The restoration of credibility to a government by the purging of perpetrators of crimes committed under an earlier regime. 

  • A rite of purification, especially washing. 

repression

noun
  • The involuntary rejection from consciousness of painful or disagreeable ideas, memories, feelings, or impulses. 

  • The act of repressing; state of being repressed. 

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