cleavage vs herniation

cleavage

noun
  • The hollow or separation between a woman's breasts, especially as revealed by a low neckline. 

  • The repeated division of a cell into daughter cells after mitosis. 

  • The tendency of a crystal to split along specific planes. 

  • Any similar separation between two body parts, such as the buttocks or toes. 

  • The act of cleaving or the state of being cleft. 

  • The splitting of a large molecule into smaller ones. 

  • The division of voters into voting blocs. 

herniation

noun
  • The formation of a hernia. 

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