herbal tea vs high tea

herbal tea

noun
  • A beverage made by infusing the leaves of various herbs, generally not including true tea (Camellia sinensis). 

high tea

noun
  • Formal afternoon tea. 

  • A late afternoon or early evening meal, typically consisting of a cooked dish with bread and butter and tea. 

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