black tea vs cha

black tea

noun
  • A cup of tea served without milk. 

  • Tea leaves which have been "fermented" (actually, oxidized) before drying to enhance their flavour (cf. green 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 

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