dung vs faeces

dung

noun
  • Manure; animal excrement. 

  • A type of manure, as from a particular species or type of animal. 

verb
  • To release dung: to defecate. 

  • To immerse or steep, as calico, in a bath of hot water containing cow dung, done to remove the superfluous mordant. 

  • To discard (especially rubbish); to chuck out. 

  • To fertilize with dung. 

faeces

noun
  • UK, Canada, Ireland, South Africa, Australia, and New Zealand standard spelling of feces. 

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