caesura vs rupture

caesura

noun
  • A break of an era or other measure of history and time; where one era ends and another begins; turning point. 

  • Using two words to divide a metrical foot. 

  • A pause or interruption in a poem, music, building, or other work of art. 

  • The caesura mark ‖ or ||. 

rupture

noun
  • A burst, split, or break. 

  • A social breach or break, between individuals or groups. 

  • A failure mode in which a tough ductile material pulls apart rather than cracking. 

  • A break or tear in soft tissue, such as a muscle. 

verb
  • To burst, break through, or split, as under pressure. 

  • To dehisce irregularly. 

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