heliotrope vs sunflower

heliotrope

noun
  • The fragrance of heliotrope flowers. 

  • A light purple or violet colour. 

  • Particularly, a purple-flowered plant of the species Heliotropium arborescens. 

  • A bloodstone (a variety of quartz). 

  • An instrument, employed in triangulation, that uses a mirror to reflect sunlight toward another, very distant, surveyor. 

  • A plant that turns so that it faces the sun. 

adj
  • Light purple or violet. 

  • Keeping one’s face turned toward the sun. 

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 heliotrope and sunflower occurred in a corpus of books? (source: Google Ngram Viewer )