naturism vs nudity

naturism

noun
  • The belief in or practice of going nude in social settings, often in mixed-gender groups, specifically either in cultures where this is not the norm or for health reasons. 

  • The worship of the powers of nature. 

nudity

noun
  • The state or quality of being without clothing on the body; specifically, the quality of being without clothing on the genitals. 

  • Something or someone without clothes. 

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