pole star vs shepherd

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. 

shepherd

noun
  • Someone who watches over, looks after, or guides somebody. 

  • A person who tends sheep, especially a grazing flock. 

  • A swain; a rustic male lover. 

  • The pastor of a church; one who guides others in religion. 

  • A male sheep tender 

  • A German Shepherd. 

  • A male pastor 

  • A male watcher/guardian/guider/leader 

verb
  • To obstruct an opponent from getting to the ball, either when a teammate has it or is going for it, or if the ball is about to bounce through the goal or out of bounds. 

  • To watch over; to guide. 

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