Janus vs leech

Janus

name
  • Used to indicate an azo dye with a quaternary ammonium group, frequently with the diazo component being safranine. 

  • A moon of Saturn. 

  • A two-faced person, a hypocrite. 

  • The god of doorways, gates and transitions, and of beginnings and endings, having two faces looking in opposite directions. 

  • Used to indicate things with two faces (such as animals with diprosopus) or aspects; or made of two different materials; or having a two-way action. 

leech

noun
  • A person who derives profit from others in a parasitic fashion. 

  • The aft edge of a triangular sail. 

  • An aquatic blood-sucking annelid of class Hirudinea, especially Hirudo medicinalis. 

  • A healer. 

  • The vertical edge of a square sail. 

verb
  • To drain (resources) without giving back. 

  • To apply a leech medicinally, so that it sucks blood from the patient. 

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