cohere vs relate

cohere

verb
  • To be consistent as part of a group, or by common purpose. 

  • To stick together physically, by adhesion. 

relate

verb
  • To bring into a relation, association, or connection (between one thing and another). 

  • To interact. 

  • To respond through reaction. 

  • To have a connection. 

  • To identify with; to understand. 

  • To tell in a descriptive way. 

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