jennet vs wild horse

jennet

noun
  • A small Spanish horse. 

  • A female ass or donkey; a jenny. 

wild horse

noun
  • A feral horse. 

  • An untamed horse. 

  • A member of the species Equus ferus, sometimes excluding the domesticated horse. 

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