black tea vs masala chai

black tea

noun
  • A cup of tea served without milk. 

  • Tea leaves which have been "fermented" (actually, oxidized) before drying to enhance their flavour (cf. green tea). 

masala chai

noun
  • Various beverages including sweetened black tea with milk and spices. 

How often have the words black tea and masala chai occurred in a corpus of books? (source: Google Ngram Viewer )