easiness vs naturalness

easiness

noun
  • Lack of difficulty; quality of not being frustrating, difficult, or dense (compact). 

  • Looseness or pliancy, often derogatory 

  • Freedom from inhibition and awkwardness: grace. 

  • Lack of harshness: gentleness, kindness. 

  • Freedom from discomfort and worry: comfort. 

  • Lack of concern or care: carelessness, indolence. 

  • Lack of firm conviction: gullibility, credulity. 

  • Lack of difficulty or trouble: facility; simplicity. 

naturalness

noun
  • The state or quality of being natural. 

  • Of a picture or recording, likeness to the original. 

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