complainant vs denialist

complainant

noun
  • One who makes complaint. 

  • An alleged victim in a criminal investigation or trial. 

  • The party that brings a civil lawsuit against another; the plaintiff. 

denialist

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

adj
  • Relating to denial in a controversial debate. 

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