heather vs turtle dove

heather

noun
  • Various species of the genus Cassiope. 

  • A plant in the family Ericaceae. 

  • Various species of the genus Erica. 

  • A purple colour with a tint of pink and blue. 

  • An evergreen plant, Calluna vulgaris, with spiky leaves and small purple, pink, or white flowers. 

  • The use of interwoven yarns of mixed colours to produce flecks. 

adj
  • Of a purple colour with a tint of pink and blue. 

turtle dove

noun
  • Any of several (species of) birds, called by this traditional name, mainly in the genus Streptopelia, of the family Columbidae (doves and pigeons, which also included the extinct passenger pigeon, dodo, and solitaire). 

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