bureau vs federal agency

bureau

noun
  • An office (room where clerical or professional duties are performed). 

  • An organization or office for collecting or providing information or news. 

  • A chest of drawers for clothes. 

  • A desk, usually with a cover and compartments that are located above the level of the writing surface rather than underneath, and often used for storing papers. 

  • An administrative unit of government; office. 

federal agency

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