contactual vs related

contactual

adj
  • Of or relating to contact. 

related

adj
  • Standing in relation or connection. 

  • Fulfilling a relation. 

  • Being a relative of. 

  • Narrated; told. 

  • Synonym of relative. 

  • Having a relationship with the thing named 

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