congress vs second chamber

congress

noun
  • An association, especially one consisting of other associations or representatives of interest groups. 

  • A legislative body of a state, originally the bicameral legislature of the United States of America. 

  • A group of baboons; the collective noun for baboons. 

  • A formal gathering or assembly; a conference held to discuss or decide on a specific question. 

verb
  • To assemble together. 

  • To meet in a congress. 

second chamber

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