emollient vs letting

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. 

letting

noun
  • Hyponyms: sublease, underlease, subtenancy, undertenancy, subletting, underletting, (informal) sublet, underlet 

  • Synonym of tenancy. 

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