kola nut vs soda

kola nut

noun
  • The edible seed of the kola tree, Cola acuminata and related species, used as a flavoring and as a source of caffeine. 

soda

noun
  • A glass, bottle or can of this drink. 

  • The first card in the dealing box in the game of faro, which is discarded to leave 51 cards in play. 

  • Sodium bicarbonate (usually baking soda). 

  • Sodium carbonate (usually washing soda). 

  • Carbonated water (water impregnated with pressurised carbon dioxide, originally made with sodium bicarbonate). 

  • Any carbonated (usually sweet) soft drink. 

  • Sodium in chemical combination. 

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