ragging vs sneering

ragging

noun
  • The act of one who rags or teases. 

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

sneering

noun
  • The act of one who sneers. 

adj
  • contemptful 

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