pack animal vs sumpter

pack animal

noun
  • A domesticated animal used to carry heavy items. 

  • A wild animal that lives and hunts in packs 

sumpter

noun
  • A packhorse; a beast of burden. 

  • The driver of a packhorse. 

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