earthworm vs pipe snake

earthworm

noun
  • A contemptible person; a groveller. 

  • A worm that lives in the ground. 

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

pipe snake

noun
  • Synonym of plumber's snake 

  • Shieldtail snake, family Uropeltidae. 

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