chinky vs zipperhead

chinky

noun
  • A Chinese person. 

  • A meal of Chinese food. 

  • A Chinese takeaway restaurant. 

  • A person from Northeast India. 

adj
  • Possessing attributes of, or similar to, a Chinese person or Chinese style or culture. 

  • Full of chinks, laden with small cracks or openings. 

zipperhead

noun
  • A person of East Asian descent. 

  • A soldier in the Royal Canadian Armoured Corps or in the Armoured Crewman military trade. 

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