drudgery vs leisure

drudgery

noun
  • Exhausting, menial, and tedious work. 

leisure

noun
  • Free time, time free from work or duties. 

  • Time at one's command, free from engagement; convenient opportunity; hence, convenience; ease. 

  • Freedom provided by the cessation of activities. 

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