caterpillar vs larva

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 

larva

noun
  • An early stage of growth for some insects and amphibians, in which after hatching from their egg, insects are wingless and resemble a caterpillar or grub, and amphibians lack limbs and resemble fish. 

  • A form of a recently born or hatched animal that is quite different from its adult stage. 

  • A preliminary stage of someone or something, before it has fully matured, especially a time of growth rather than one of performance. 

  • An animal in the aforementioned stage. 

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