furtherance vs stepping

furtherance

noun
  • The act of furthering or helping forward 

  • Promotion. 

  • Advancement or progress. 

stepping

noun
  • The act of taking a step. 

  • A specific iteration of a model of central processing unit, often distinguished by the addition or removal of features compared to earlier examples of the same processor, or the presence, or lack thereof, of specific bugs. 

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