heliotrope vs ruby

heliotrope

noun
  • A bloodstone (a variety of quartz). 

  • A light purple or violet colour. 

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

  • 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. 

ruby

noun
  • A clear, deep, red variety of corundum, valued as a precious stone. 

  • A deep red colour. 

  • A ruby hummer, a South American hummingbird, Clytolaema rubricauda. 

  • A red bird-of-paradise, Paradisaea rubra. 

  • A pronunciation guide written above or beside Chinese or Japanese characters. 

  • The tincture red or gules. 

adj
  • Of a deep red colour. 

verb
  • To make red; to redden. 

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