nudism vs nudity

nudism

noun
  • The belief in or practice of going nude in social, nonsexualized and frequently mixed-gender groups specifically in cultures where going nude in the social situation is not the norm. 

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 nudism and nudity occurred in a corpus of books? (source: Google Ngram Viewer )