adusk vs swart

adusk

adj
  • Resembling conditions at dusk or twilight, low-lit, dark; in darkness, gloomy. 

adv
  • At dusk; in the dusk or twilight. 

swart

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

  • Black. 

noun
  • Black or dark dyestuff. 

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

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