heliotrope vs viola

heliotrope

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

  • A light purple or violet colour. 

  • A bloodstone (a variety of quartz). 

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

  • The fragrance of heliotrope flowers. 

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

adj
  • Light purple or violet. 

  • Keeping one’s face turned toward the sun. 

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