inchworm vs looper

inchworm

noun
  • The larva of a moth of the family Geometridae. 

verb
  • To move in a looping fashion, like an inchworm. 

  • To crawl or creep slowly. 

looper

noun
  • A moth having a caterpillar which arches its body into a loop in order to bring the back part of the body forward as it walks due to having fewer prolegs, including inchworms or measuring worms in the family Geometridae and some species in the family Noctuidae. 

  • An instrument or tool, such as a bodkin, for forming a loop in yarn or cord, etc. 

  • A (usually electronic) tool for creating music loops. 

  • A golf caddy 

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