belligerence vs xenophobia

belligerence

noun
  • The state of being belligerent; aggressive inclination to war. 

xenophobia

noun
  • A strong antipathy or aversion to strangers or foreigners. 

  • A fear of aliens. 

  • A fear of strangers or foreigners. 

  • A hatred of strangers or foreigners. 

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