bastion vs defense

bastion

noun
  • A person, group, or thing, that strongly defends some principle. 

  • A well-fortified position; a stronghold or citadel. 

  • A projecting part of a rampart or other fortification. 

  • Any large prominence; something that resembles a bastion in size and form. 

verb
  • To furnish with a bastion. 

defense

noun
  • The action of defending or protecting from attack, danger, or injury. 

  • Government policy or (infra)structure related to the military. 

  • A strategy and tactics employed to prevent the other team from scoring; contrasted with offense. 

  • The case presented by the defendant in a legal proceeding. 

  • The lawyer or team thereof who presents such a case. 

  • The portion of a team dedicated to preventing the other team from scoring; contrasted with offense. 

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