chittim vs shittah

chittim

noun
  • A type of wood mentioned in the Bible, from which the Ark of the Covenant was constructed. 

  • The cascara, Rhamnus purshiana. 

  • The yellow cottonwood , Populus deltoides. 

  • The false buckthorn, Bumelia Lanuginosa. 

  • A Nigerian currency. 

shittah

noun
  • A tree said in the Bible to have furnished the precious wood of which the ark, tables, altars, boards, etc., of the Jewish tabernacle were made; now believed to have been the red acacia, Acacia seyal, now Vachellia seyal. 

  • The wood of this tree. 

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