juncture vs turning point

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. 

turning point

noun
  • A crossroads. 

  • A T-junction. 

  • A decisive point at which a significant change or historical event occurs, or at which a decision must be made. 

  • A maximum or minimum on a graph. 

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