related vs unwritten

related

adj
  • Narrated; told. 

  • Fulfilling a relation. 

  • Standing in relation or connection. 

  • Being a relative of. 

  • Synonym of relative. 

  • Having a relationship with the thing named 

unwritten

adj
  • Implicit or understood but not formally articulated. 

  • Not written. 

  • Oral or otherwise communicated without writing. 

  • Containing no writing; blank. 

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