lilac vs viola

lilac

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

  • A flower of the lilac shrub. 

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

adj
  • Having a pale purple colour. 

viola

noun
  • Any of several flowering plants, of the genus Viola, including the violets and pansies. 

  • A 10-string steel-string acoustic guitar, used in Brazilian folk music. 

  • A person who plays the viola. 

  • An organ stop having a similar tone. 

  • A berimbau viola, the smallest member of the berimbau used in capoeira music. 

  • A stringed instrument of the violin family, somewhat larger than a violin, played under the chin, and having a deeper tone. 

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