fissure vs juncture

fissure

noun
  • 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. 

  • A state of incompatibility or disagreement. 

verb
  • To split, forming fissures. 

juncture

noun
  • A place where things join, a junction. 

  • A critical moment in time. 

  • The manner of moving (transition) or mode of relationship between two consecutive sounds; a suprasegmental phonemic cue, by which a listener can distinguish between two otherwise identical sequences of sounds that have different meanings. 

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