pigging vs roaring

pigging

adj
  • Damned (used as a mild intensive). 

noun
  • The use of a pig (the device) to clean a pipeline. 

roaring

adj
  • Intensive; extreme. 

  • Very successful; lively. 

noun
  • An affection of the windpipe of a horse, causing a loud, peculiar noise in breathing under exertion. 

  • A loud, deep, prolonged sound, as of a large beast; a roar. 

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