russet vs umber

russet

adj
  • Having a reddish-brown color. 

  • The condition of leather when its treatment is complete, but it is not yet colored (stained) and polished. 

  • Rustic, homespun, coarse, plain. 

  • Having a rough skin that is reddish-brown or greyish; russeted. 

noun
  • A variety of apple with rough, russet-colored skin. 

  • A coarse, reddish-brown, homespun fabric; clothes made with such fabric. 

  • A reddish-brown color. 

  • A variety of potato with rough, dark gray-brown skin. 

verb
  • To develop reddish-brown spots; to cause russeting. 

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 russet and umber occurred in a corpus of books? (source: Google Ngram Viewer )