emollient vs relaxant

emollient

noun
  • Something which softens or lubricates the skin; moisturizer. 

  • Anything soothing the mind, or that makes something more acceptable. 

adj
  • Moisturizing. 

  • Soothing or mollifying. 

relaxant

noun
  • A drug or other agent that promotes relaxation. 

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