half-caste vs thoroughbred

half-caste

adj

  • Of mixed racial descent. 

noun

  • A person of mixed racial descent. 

thoroughbred

adj

  • well-bred and properly educated. 

  • Bred from pure stock. 

noun

  • A well-bred person. 

  • A person of uncommon strength or endurance (like that of a thoroughbred horse). 

  • Any purebred horse. 

How often have the words half-caste and thoroughbred occurred in a corpus of books? (source: Google Ngram Viewer )