khaki vs umber

khaki

adj
  • Dust-coloured; of the colour of dust. 

noun
  • khaki (Pantone) 

  • A British person (from the colour of the uniform of British troops, originally in the Second Boer War; compare rooinek). (In this sense the plural generally is khakies.) 

  • khaki green 

  • A soldier wearing a khaki uniform. 

  • Khaki clothing or uniform. 

  • Khaki green, a dull green colour. 

  • A strong cloth of wool or cotton, often used for military or other uniforms. 

  • A dull, yellowish-brown colour, the colour of dust. 

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