council vs lower chamber

council

noun
  • A committee that leads or governs (e.g. city council, student council). 

  • Discussion or deliberation. 

lower chamber

noun
  • The lower legislative chamber in a bicameral legislature; in many cases, the one that is directly elected and/or has more practical power, such as the power to raise and spend money. 

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