nudism vs undress

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. 

undress

noun
  • Now more specifically, a state of having few or no clothes on. 

  • Partial or informal dress for women, as worn in the home rather than in public. 

  • Informal clothing for men, as opposed to formal or ceremonial wear. 

verb
  • To remove the clothing of (someone). 

  • To remove one's clothing. 

  • To remove one’s clothing. 

  • To strip of something. 

  • To take the dressing, or covering, from. 

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