abidance vs synchronism

abidance

noun
  • Adherence; compliance; conformity. 

  • The act of abiding or continuing; abode; stay; continuance; dwelling. 

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 abidance and synchronism occurred in a corpus of books? (source: Google Ngram Viewer )