aurochs vs bullock

aurochs

noun

  • The European bison (Bison bonasus, or Europæus). 

  • An extinct European mammal, Bos primigenius, the ancestor of domestic cattle. 

bullock

noun

  • A castrated bull; an ox. 

verb

  • To bully. 

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