cockroach vs greenfly

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. 

greenfly

noun
  • Any of several kinds of common insects green in color 

  • Certain aphids (Aphidoidea), commonly known as greenfly in Britain and the Commonwealth 

  • Lucilia sericata, common green bottle fly 

  • especially, Myzus persicae, green peach aphid 

  • Odontomyia chloris (syn. Musca chloris) 

  • Tabanus nigrovittatus, a biting horsefly more commonly known as the greenhead horsefly, greenhead fly, or greenhead 

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