Germ vs cockroach

Germ

noun
  • a German person. 

cockroach

noun
  • A Tutsi. 

  • A person from New South Wales. 

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

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

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