polar vs synonymous

polar

adj
  • Of, relating to, measured from, or referred to a geographic pole (the North Pole or South Pole); within the Arctic or Antarctic circles. 

  • Having but two possible answers, yes and no. 

  • Having a dipole; ionic. 

  • Of an orbit that passes over, or near, one of these poles. 

  • Of or having a pole or polarity. 

  • Of a coordinate system, specifying the location of a point in a plane by using a radius and an angle. 

noun
  • The line joining the points of contact of tangents drawn to meet a curve from a point called the pole of the line. 

synonymous

adj
  • Having an identical meaning. 

  • Having a similar meaning. 

  • Such that both its forms yield the same sequenced protein. 

  • Of, or being a synonym. 

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