blackberry vs heliotrope

blackberry

noun
  • The soft fruit borne by this shrub, formed of a black (when ripe) cluster of drupelets. 

  • A fruit-bearing shrub of the aggregate species Rubus fruticosus and some hybrids. 

  • The blackcurrant. 

verb
  • To gather or forage for blackberries. 

heliotrope

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

  • 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. 

  • The fragrance of heliotrope flowers. 

adj
  • Light purple or violet. 

  • Keeping one’s face turned toward the sun. 

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