desynchronization vs synchronism

desynchronization

noun
  • The loss or absence of synchronization; asynchronism. 

  • A loss of synchronization of brain waves. 

synchronism

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

  • A temporal relationship between events. 

  • The state of being synchronous. 

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