legislative body vs lower chamber

legislative body

noun
  • Its equivalent, exercising legislative power at a sub-state administrative level. 

  • A political institution which holds the legislative power in a state, and often controls the executive power. 

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 legislative body and lower chamber occurred in a corpus of books? (source: Google Ngram Viewer )