agitationist vs agitator

agitationist

noun
  • Synonym of agitator (“one who stirs up or excites others, for example political reformers”) 

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. 

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