bird dog vs research

bird dog

verb
  • To seek out. 

  • A multiservice tactical brevity code requesting configuration of sensors. 

  • To watch closely. 

noun
  • A dog, especially a pointer, used in shooting to retrieve the dead birds. 

  • A tout. 

  • A person who seeks out real estate investment opportunities in exchange for a fee. 

  • A person who tries to steal someone else's romantic partner 

  • A radar detector (for detecting police speed traps). 

  • A hyperextension exercise performed lying on the knees, with one arm and the opposite leg lifted. 

research

verb
  • To search again. 

  • To search or examine with continued care; to seek diligently. 

  • To make an extensive investigation into. 

noun
  • Diligent inquiry or examination to seek or revise facts, principles, theories, applications, etc.; laborious or continued search after truth. 

  • The research station that houses Wang and his team is outside Lijiang, a city of about 1.2 million people. File:The research station that houses Wang and his team is outside Lijiang.ogg 

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