synergism vs synergy

synergism

noun
  • synergy 

  • The theological doctrine that salvation is brought about by a combination of human will and divine grace 

synergy

noun
  • The cooperation of two or more nerves, muscles, organs, etc. 

  • Benefits resulting from combining different groups, people, objects or processes. 

  • A synonym of binding energy. 

  • The combined action of two or more drugs where the effects are stronger than their mere sum. 

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