caesura vs cleft

caesura

noun
  • 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 ||. 

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

cleft

noun
  • A piece made by splitting. 

  • An opening, fissure, or V-shaped indentation made by or as if by splitting. 

  • A disease of horses; a crack on the band of the pastern. 

verb
  • To syntactically separate a prominent constituent from the rest of the clause that concerns it, such as threat in "The threat which I saw but which he didn't see, was his downfall." 

adj
  • split, divided, or partially divided into two. 

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