cha vs tea tree

cha

noun
  • tea, sometimes (dialect) specifically masala chai 

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

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

pron
  • You. 

tea tree

noun
  • The tea plant (Camellia sinensis), from which black, green, oolong and white tea are all obtained. 

  • The tree Melaleuca alternifolia, from which tea tree oil is obtained. 

  • The shrub ti (Cordyline fruticosa). 

  • The kanuka, Kunzea ericoides. 

  • A shrub or small tree native to New Zealand and southeast Australia (Leptospermum scoparium). 

  • The duke of Argyll's tea tree (Lycium barbarum), also known as wolfberry or matrimony vine. 

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