aggression vs repression

aggression

noun
  • Hostile or destructive behavior or actions. 

  • The practice or habit of launching attacks. 

  • The act of initiating hostilities or invasion. 

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 aggression and repression occurred in a corpus of books? (source: Google Ngram Viewer )