bronze vs umber

bronze

adj
  • Having a reddish-brown colour. 

  • Made of bronze metal. 

  • Tanned; darkened as a result of exposure to the sun. 

verb
  • To color bronze; (of the sun) to tan. 

  • To change to a bronze or tan colour due to exposure to the sun. 

  • To make hard or unfeeling; to brazen. 

  • To plate with bronze. 

noun
  • A naturally occurring or man-made alloy of copper, usually in combination with tin, but also with one or more other metals. 

  • A work of art made of bronze, especially a sculpture. 

  • A reddish-brown colour, the colour of bronze. 

  • Boldness; impudence. 

  • A bronze medal. 

umber

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

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. 

verb
  • To give a reddish-brown colour to. 

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