hawkmoth vs hornworm

hawkmoth

noun
  • Any of several moths, of the family Sphingidae, that hover over flowers when sucking nectar through a long proboscis. 

hornworm

noun
  • Some moths in the genus Manduca of the hawk moth family Sphingidae. 

  • A caterpillar of a hawk moth that has a hornlike tail process. 

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