cockroach vs wog

cockroach

noun
  • A black or brown straight-winged insect of the order Blattodea. 

  • A Tutsi. 

  • A person from New South Wales. 

  • A person or a member of a group of people regarded as undesirable and rapidly procreating. 

wog

noun
  • A bug, an insect. 

  • A person of Southern European, Mediterranean, Middle Eastern, or Southeastern European ancestry. 

  • Any dark-skinned person: originally specifically an Indian, but later also anybody of North African, Mediterranean, or Middle Eastern ancestry. 

  • A pollywog, or sailor who has never crossed the Equator. 

  • A minor illness caused by bacteria, virus, intestinal parasite, etc. 

  • A person who is not a Scientologist. 

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