caterpillar vs phasmid

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 

phasmid

noun
  • Any insect of the order Phasmida: a leaf insect or walking stick (stick insect). 

  • A phagemid. 

  • Either of the two caudal chemoreceptors in some nematodes. 

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