letting vs sparing

letting

noun
  • Synonym of tenancy. 

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

sparing

noun
  • The act by which something or someone is spared. 

adj
  • Prudent and restrained in the use of resources; careful, economical or frugal. 

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