irenic vs irenical

irenic

adj
  • Promoting or fitted to promote peace, especially over disputes; conciliatory, non-confrontational, peaceful. 

irenical

adj
  • Synonym of irenic (“promoting or fitted to promote peace, especially over disputes; conciliatory, non-confrontational, peaceful”) 

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