cha vs herb tea

cha

noun
  • tea, sometimes (dialect) specifically masala chai 

  • Synonym of Korean foot: a traditional unit of length equivalent to about 30.3 cm. 

pron
  • You. 

particle
  • Used to count out steps, particularly involving the hip-shaking sections of rhythmic Latin dances 

herb tea

noun
  • A beverage (a tisane) made by steeping herbs (sometimes also includes other plants, such as spices), other than tea leaves, in hot water. Technically not a tea because it does not contain tea leaves. 

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