accordance vs synchronism

accordance

noun
  • Agreement; harmony; conformity; compliance. 

  • The act of granting something. 

synchronism

noun
  • The state of being synchronous. 

  • The tabular arrangement of contemporary events etc. in history. 

  • A temporal relationship between events. 

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