bullfinch vs sorrel

bullfinch

noun
  • Any of various other Old World finches in the genus Pyrrhula. 

  • The Eurasian bullfinch (Pyrrhula pyrrhula). 

sorrel

noun
  • Members of genus Oxalis or family Oxalidaceae, woodsorrels. 

  • Rumex acetosa (common sorrel, garden sorrel), sometimes used as a salad vegetable. 

  • The roselle, Hibiscus sabdariffa. 

  • A brown colour, with a tint of red. 

  • A drink, consumed especially in the Caribbean around Christmas, made from the flowers of Hibiscus sabdariffa: hibiscus tea. 

adj
  • Of a brown colour, with a tint of red. (especially: a sorrel horse) 

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