green tea vs gunpowder tea

green tea

noun
  • A beverage brewed from green tea leaves. 

  • Leaves of the tea plant which are treated with steam or roasted to denature the enzymes that cause the leaves to darken and change taste. (Without this step they would become oolong tea or black tea). 

gunpowder tea

noun
  • A form of Chinese green tea in which each leaf has been rolled into a small round pellet. 

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