nark vs slummock

nark

verb
  • To annoy or irritate. 

  • To stop. 

  • To serve or behave as a spy or informer. 

  • To complain. 

  • To watch; to observe. 

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

  • A police spy or informer. 

slummock

verb
  • To behave awkwardly or clumsily 

  • To behave lazily or indolently 

noun
  • A slovenly person 

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