apartheid vs casteism

apartheid

noun
  • A policy or situation of segregation based on some specified attribute. 

  • Any similar policy of racial separation/segregation and discrimination. 

  • The policy of racial separation used by South Africa from 1948 to 1990. 

verb
  • To impose a policy of segregation of groups of people, especially one based on race. 

casteism

noun
  • discrimination based on a person's caste 

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