coincident vs related

coincident

adj
  • Being in accordance, matching. 

  • Occurring at the same time. 

  • Being in the same location. 

noun
  • Either of multiple simultaneous related incidents 

related

adj
  • Fulfilling a relation. 

  • Standing in relation or connection. 

  • Being a relative of. 

  • Narrated; told. 

  • Synonym of relative. 

  • Having a relationship with the thing named 

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