conservationist vs defender

conservationist

noun
  • Someone who advocates for these actions. 

  • A person who maintains natural areas or protects threatened species. 

defender

noun
  • Someone who defends people or property. 

  • A defendant in a civil action. 

  • A fighter who seeks to repel an attack. 

  • A lawyer who represents defendants, especially a public defender; a defense attorney (US) or defence counsel (UK). 

  • One of the players whose primary task is to prevent the opposition from scoring. 

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