battlement vs protection

battlement

noun
  • In fortification: an indented parapet, formed by a series of rising members called cops or merlons, separated by openings called crenelles or embrasures, the soldier sheltering himself behind the merlon while he fires through the embrasure or through a loophole in the battlement. 

  • The towering roof of heaven. 

  • Any high wall for defense. 

protection

noun
  • A means of keeping or remaining safe. 

  • Coverage. 

  • The process of keeping (something or someone) safe. 

  • The state of being safe. 

  • An instance of a security token associated with a resource (such as a file). 

  • Restrictions on foreign competitors which limit their ability to compete with domestic producers of goods or services. 

  • A means, such as a condom, of preventing pregnancy or sexually transmitted disease. 

  • Immunity from harm, obtained by illegal payments, as bribery or extortion. 

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