tiger balm vs tranquilizer

tiger balm

noun
  • A liniment containing camphor, menthol, etc., intended for pain relief. 

tranquilizer

noun
  • A drug used to reduce anxiety or tension. 

  • That which tranquillizes or soothes. 

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