demulcent vs tranquilizer

demulcent

noun
  • A soothing medication used to relieve pain in inflamed tissues. 

adj
  • Soothing or softening. 

tranquilizer

noun
  • A drug used to reduce anxiety or tension. 

  • That which tranquillizes or soothes. 

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