consistory vs convention

consistory

noun
  • A solemn assembly or council. 

  • An assembly of prelates; a session of the college of cardinals at Rome. 

  • The spiritual court of a diocesan bishop held before his chancellor or commissioner in his cathedral church or elsewhere. 

  • A church tribunal or governing body, especially of elders in a Reformed church. 

convention

noun
  • The convening of a formal meeting. 

  • A formal agreement, contract, rule, or pact. 

  • A treaty or supplement to such. 

  • A meeting or gathering. 

  • A practice or procedure widely observed in a group, especially to facilitate social interaction; a custom. 

  • A formal deliberative assembly of mandated delegates. 

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