lilac vs sunflower

lilac

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. 

adj
  • Having a pale purple colour. 

sunflower

noun
  • A bright yellow, like that of the flower petals. 

  • Any flat, radially symmetric organic compound such as coronene 

  • Any plant of the genus Helianthus, so called probably from the form and color of its floral head, having the form of a large disk surrounded by yellow ray flowers. 

  • The commonly cultivated species, Helianthus annuus, a native of America. 

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