agitator vs denialist

agitator

noun
  • One who agitates; one who stirs up or excites others, for example political reformers. 

  • An implement for shaking or mixing. 

  • One of a body of men appointed by the army, in Oliver Cromwell's time, to look after their interests. 

denialist

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

adj
  • Relating to denial in a controversial debate. 

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