caterpillar vs flyblow

caterpillar

noun
  • The larva of a butterfly or moth; leafworm 

  • A vehicle with a caterpillar track; a crawler 

  • A set of subtrees of a tree 

flyblow

noun
  • The larva of the blowfly, especially when found on rotten meat. 

verb
  • To deposit eggs upon, as a blowfly does on meat; to cause to be maggoty. 

  • To taint or contaminate. 

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