swarthy vs tar baby

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. 

tar baby

noun
  • A black person. 

  • A difficult, abstract problem that worsens as one attempts to handle it; a "sticky" situation, especially one where attempts to make it better only make it worse. 

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