kai vs tiffin

kai

noun
  • food 

tiffin

noun
  • A (light) midday meal or snack; luncheon. 

  • A box or container used to carry a tiffin. 

  • A cake-like confection composed of crushed biscuits, sugar, syrup, raisins, cherries and cocoa powder, often covered with a layer of melted chocolate. 

verb
  • To eat a (light) midday meal or snack. 

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