kaffir vs swarthy

kaffir

noun
  • A black person. 

  • South African mining shares 

  • A member of the Nguni people of southern Africa, especially a Xhosa. 

  • A language spoken by the Nguni peoples of southern Africa, especially Xhosa. 

  • In Islamic contexts, a non-Muslim. 

swarthy

noun
  • A swarthy person. 

adj
  • Tawny, dusky, dark. 

  • Dark-skinned; Black. 

  • Weathered, rough. 

  • A dark grey color. 

  • Evil, malicious. 

  • Darker-skinned than white, but lighter-skinned than tawny; tan. 

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