dampness vs perspiration

dampness

noun
  • Moderate humidity; moisture; moistness; the state or quality of being damp. 

  • The degree to which something is damp or moist. 

perspiration

noun
  • A saline fluid secreted by the sweat glands; sweat. 

  • The action or process of perspiring. 

  • Hard work. 

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