calmant vs stupefacient

calmant

noun

  • A calming drug; a sedative. 

stupefacient

noun

  • Any drug that induces stupor or drowsiness. 

adj

  • Inducing stupor or drowsiness (with a drug such as a narcotic or an anaesthetic). 

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