ragging vs reprimand

ragging

noun
  • The act of one who rags or teases. 

  • An initiation in educational institutions (e.g. universities) usually involving harassment by upperclassmen. 

reprimand

noun
  • A severe, formal or official reproof; reprehension, rebuke, private or public. 

verb
  • To reprove in a formal or official way. 

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