leisure vs shore leave

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. 

shore leave

noun
  • Free time given to sailors of the military navy when they are off duty and allowed to disembark and spend time on land. 

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