soda vs sodium

soda

noun
  • Sodium in chemical combination. 

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  • Carbonated water (water impregnated with pressurised carbon dioxide, originally made with sodium bicarbonate).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

noun
  • Employing sodium. 

  • The chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.990. It is a soft, waxy, silvery, reactive alkali metal that is never found unbound in nature. 

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