abstention vs denialist

abstention

noun
  • The act of declining to vote on a particular issue. 

  • Non-participation in the political world; as a country avoiding international affairs. 

  • The act of abstaining or refraining (from). 

denialist

noun
  • One who denies an assertion in a controversial debate. 

adj
  • Relating to denial in a controversial debate. 

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