oof vs paper money

oof

noun
  • A sound made in pain, as when expelling air after being struck. 

intj
  • A sound mimicking the loss of air, as if someone's solar plexus had just been struck. 

  • Synonym of ouch (“expressing sympathy at another's pain, shock at a high price, etc.”) 

paper money

noun
  • A type of joss paper resembling banknotes burnt to venerate the deceased, ancestor spirits, deities, etc. 

  • Cash in the form of banknotes. 

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