crossroads vs watershed

crossroads

noun
  • A decision point; a turning point or opportunity to change direction, course, or goal. 

  • A place where one road crosses another; an intersection of two or more roads. 

  • A fork in the road. 

  • A centrally located position 

watershed

noun
  • A critical point marking a change in course or development. 

  • The topographical boundary dividing two adjacent catchment basins, such as a ridge or a crest. 

  • A region of land within which water flows down into a specified body, such as a river, lake, sea, or ocean; a drainage basin. 

  • The time after which material of more adult nature (violence, swear words, sex) may be broadcast on television or radio, either one laid down by law or one contrived from convention (e.g. when children are not watching) 

adj
  • Serving to mark a significant development, change in direction, etc. 

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