badger vs earthworm

badger

noun
  • Any mammal of three subfamilies, which belong to the family Mustelidae: Melinae (Eurasian badgers), Mellivorinae (ratel or honey badger), and Taxideinae (American badger). 

  • A native or resident of the American state, Wisconsin. 

verb
  • To pester; to annoy persistently; to press. 

earthworm

noun
  • A worm of the family Lumbricidae, or, more generally, of the suborder Lumbricina. 

  • A worm that lives in the ground. 

  • A contemptible person; a groveller. 

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