director vs pole star

director

noun
  • That which directs or orientates something. 

  • A device that displays graphical information concerning the targets of a weapons system in real time. 

  • A counselor, confessor, or spiritual guide. 

  • The common axis of symmetry of the molecules of a liquid crystal. 

  • A member of a board of directors. 

  • One who directs; the person in charge of managing a department or directorate (e.g., director of engineering), project, or production (as in a show or film, e.g., film director). 

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 director and pole star occurred in a corpus of books? (source: Google Ngram Viewer )