cyan vs turquoise

cyan

noun
  • A vibrant pale greenish-blue colour between blue and green in the visible spectrum; the complementary colour of red; the colour obtained by subtracting red from white light. 

adj
  • Of the colour cyan. 

turquoise

noun
  • A pale greenish-blue colour, like that of the gemstone. 

  • A sky-blue, greenish-blue, or greenish-gray semi-precious gemstone. 

  • turquoise 

adj
  • Having a pale greenish-blue colour. 

  • Made of turquoise (the gemstone). 

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