cockroach vs wanker

cockroach

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

  • A Tutsi. 

  • A person from New South Wales. 

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

wanker

noun
  • An ineffectual person. 

  • Someone who shows off too much, a poser or poseur; someone who is overly self-satisfied. 

  • A penis. 

  • An annoying person. 

  • An idiot, a stupid person. 

  • A very informal address used between friends. 

  • A person who wanks. 

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