lilac vs mulberry

lilac

adj
  • Having a pale purple colour. 

noun
  • A flower of the lilac shrub. 

  • A pale purple color, the color of some lilac flowers. 

  • A large shrub of the genus Syringa, especially Syringa vulgaris, bearing white, pale-pink, or purple flowers. 

mulberry

adj
  • Of a dark purple color tinted with red. 

noun
  • Any of several trees, of the genus Morus, having edible fruits. 

  • The fruit of this tree. 

  • A dark purple colour tinted with red. 

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