belittle vs look down on

belittle

verb
  • To knowingly say that something is smaller or less important than it actually is, especially as a way of showing contempt or deprecation. 

look down on

verb
  • To regard or treat as inferior. 

  • To view [people or events on Earth] from the vantage point of the afterlife (originally, Heaven) 

How often have the words belittle and look down on occurred in a corpus of books? (source: Google Ngram Viewer )