chai vs masala chai

chai

noun
  • A place above ground for storing wine casks. 

  • A female gypsy. 

  • A Jewish symbol representing life, traditionally worn as an amulet. 

masala chai

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

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