khaki vs rust

khaki

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

  • 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. 

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

rust

noun
  • A reddish-brown color. 

  • A similar substance based on another metal (usually with qualification, such as "copper rust"). 

  • A disease of plants caused by a reddish-brown fungus. 

  • Damage caused to stamps and album pages by a fungal infection. 

  • The deteriorated state of iron or steel as a result of moisture and oxidation. 

verb
  • To (cause to) degenerate in idleness; to make or become dull or impaired by inaction. 

  • To oxidize, especially of iron or steel. 

  • To cause to oxidize. 

  • To be affected with the parasitic fungus called rust. 

  • Of a black cat or its fur, to turn rust-coloured following long periods of exposure to sunlight. 

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