faeces vs spoor

faeces

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

spoor

noun
  • The track, trail, droppings or scent of an animal. 

verb
  • To track an animal by following its spoor 

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