bai vs charwoman

bai

noun
  • A people of the Yunnan province of China. 

  • A marshy meadow in sub-Saharan Africa. 

charwoman

noun
  • A woman employed to do housework, traditionally coming and going on a daily basis and paid weekly wages. 

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