letting vs severe

letting

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

  • Synonym of tenancy. 

severe

adj
  • Very bad or intense. 

  • Sober, plain in appearance, austere. 

  • Strict or harsh. 

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