fissure vs schism

fissure

noun
  • A state of incompatibility or disagreement. 

  • A long, narrow crack or opening made by breaking or splitting, especially in rock or earth. 

  • A groove, deep furrow, elongated cleft or tear between body parts or in the substance of an organ; a sulcus. 

  • A break or slit in tissue usually at the junction of skin and mucous membrane. 

verb
  • To split, forming fissures. 

schism

noun
  • A split or separation within a group or organization, typically caused by discord. 

  • a split within Christianity whereby a group no longer recognizes the Bishop of Rome as the head of the Church, but shares essentially the same beliefs with the Church of Rome. In other words, a political split without the introduction of heresy. 

  • A formal division or split within a religious body. 

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