North Star vs pole star

North Star

noun
  • An aim or a goal, a dependable guiding light in a quickly changing world. 

name
  • A census-designated place in New Castle County, Delaware. 

  • A star positioned circumpolar to the North Pole. 

  • An unincorporated community in Nicollet County, Minnesota. 

  • A hamlet in the County of Northern Lights, Alberta, Canada. 

  • A village in New South Wales, Australia. 

  • An unincorporated community in Portage County, Wisconsin. 

  • A number of townships in the United States, listed under North Star Township. 

  • A village in Darke County, Ohio. 

  • A settlement on the island of Saint Croix, United States Virgin Islands. 

  • An unincorporated community in Yuba County, California, formerly North Star House. 

pole star

noun
  • A person, principle, or thing which acts as a guide; a guiding light; also, something which attracts much attention; a centre of attention. 

  • The star visible to the naked eye which was in the past, is now, or will be in the future nearest a celestial pole of a planet. 

How often have the words North Star and pole star occurred in a corpus of books? (source: Google Ngram Viewer )