sudorific vs sweltering

sudorific

adj
  • In a state of perspiration; covered in sweat; sudoriferous, sweaty. 

  • That produces sweating. 

noun
  • A medicine that produces sweating. 

sweltering

adj
  • hot and humid; oppressively sticky 

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

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