parching vs sweltering

parching

adj
  • Causing something or someone to parch; extremely drying. 

  • Very thirsty; parched. 

noun
  • The condition of being parched; absolute dryness. 

  • The process of parching or roasting something, such as corn. 

sweltering

adj
  • hot and humid; oppressively sticky 

noun
  • The situation of being or feeling hot and humid. 

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