ebony vs swart

ebony

adj
  • A deep, dark black colour. 

  • Made of ebony wood. 

  • Dark-skinned; black; especially in reference to African-Americans. 

noun
  • A black key on a piano or other keyboard instrument. 

  • A tree that yields such wood. 

  • A deep, dark black colour. 

  • A hard, dense, deep black wood from various subtropical and tropical trees, especially of the genus Diospyros. 

swart

adj
  • Black. 

  • Of a dark hue; moderately black; swarthy; tawny. 

noun
  • Black or dark dyestuff. 

verb
  • To make swart or tawny; blacken; tan. 

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