Coke vs cola

Coke

noun
  • Any soft drink, regardless of type. 

  • Cola-based soft drink; (in particular) Coca-Cola. 

  • A bottle, glass or can of Coca-Cola or a cola-based soft drink. 

cola

noun
  • A beverage or a drink made with kola nut flavoring, caramel and carbonated water. 

  • The kola plant, genus Cola, famous for its nut, or one of these nuts. 

  • A cluster of buds on a cannabis plant. 

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