bagging vs billowing

bagging

noun
  • The act of putting anything into a bag. 

  • peak bagging 

  • bootstrap aggregating 

  • Cloth or other material for bags. 

  • Use of BVM to ventilate a patient. 

billowing

noun
  • The act of something that billows; a billow. 

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