repellency vs repulsion

repellency

noun
  • The ability to repel; the characteristic of repelling. 

repulsion

noun
  • The act of repelling or the condition of being repelled. 

  • An extreme dislike of something, or hostility to something. 

  • The repulsive force acting between bodies of the same electric charge or magnetic polarity. 

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