aggravation vs nark

aggravation

noun
  • Provocation, irritation, annoyance. 

  • An extrinsic circumstance or accident which increases the guilt of a crime or the misery of a calamity. 

  • The act of aggravating, or making worse; used of evils, natural or moral; the act of increasing in severity or heinousness; something additional to a crime or wrong and enhancing its guilt or injurious consequences. 

  • Exaggerated representation. 

nark

noun
  • An unpleasant person, especially one who makes things difficult for others. 

  • A police spy or informer. 

verb
  • To stop. 

  • To annoy or irritate. 

  • To serve or behave as a spy or informer. 

  • To complain. 

  • To watch; to observe. 

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