heather vs wolfberry

heather

noun
  • 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. 

  • 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. 

wolfberry

noun
  • The berry of this plant. 

  • Any of flowering species of the genus Lycium. 

  • Lycium barbarum or Lycium chinense 

  • The western snowberry, Symphoricarpos occidentalis, a shrub native to nothern and central North America. 

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