furtherance vs progression

furtherance

noun
  • The act of furthering or helping forward 

  • Promotion. 

  • Advancement or progress. 

progression

noun
  • The act of moving forward or proceeding in a course; motion onward. 

  • A sequence obtained by adding or multiplying each term by a constant. 

  • chord progression 

  • The act of moving from one thing to another. 

  • Development, increase, evolution. 

  • The making an exercise more exerting by manipulating the details of its performance like loaded weight, range of motion, angle, speed. 

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