beverage vs herbal tea

beverage

noun
  • A liquid to consume; a drink, such as tea, coffee, liquor, beer, milk, juice, or soft drinks, usually excluding water. 

herbal tea

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

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