sorrel vs umber

sorrel

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

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

  • The roselle, Hibiscus sabdariffa. 

  • A brown colour, with a tint of red. 

  • Members of genus Oxalis or family Oxalidaceae, woodsorrels. 

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

umber

adj
  • Of a reddish brown colour, like that of the pigment. 

verb
  • To give a reddish-brown colour to. 

noun
  • A dusky brown African wading bird (Scopus umbretta) allied to the shoebill and herons; a hamerkop. 

  • A grayling. 

  • A brown clay, somewhat darker than ochre, which contains iron and manganese oxides. 

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