Bushman vs San

Bushman

noun
  • A member of one of the foraging ethnic groups native to southwestern Africa, mostly the Kalahari. 

  • A person who lives in the bush, especially a member of a community or ethnic group who lives in the bush. 

San

noun
  • Any of the foraging non-Bantu ethnic groups of southwestern Africa. 

name
  • A river in southeastern Poland and western Ukraine. 

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