clement vs letting

clement

adj
  • Mild (said of weather and similar circumstances). 

  • Lenient or merciful; charitable. 

letting

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

  • Synonym of tenancy. 

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