hawthorn vs heather

hawthorn

noun
  • Any of various shrubs and small trees of the genus Crataegus having small, apple-like fruits and thorny branches 

heather

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

  • A plant in the family Ericaceae. 

  • Various species of the genus Erica. 

  • Various species of the genus Cassiope. 

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

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

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

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