prevention vs synergism

prevention

noun
  • precaution; forethought. 

  • Any measure intended to limit health-related risks (such as information campaigns, vaccination, early diagnosis etc.). 

  • The act of preventing or hindering; obstruction of action, access, or approach; thwarting. 

synergism

noun
  • synergy 

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

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