custody vs guardianship

custody

noun
  • The legal right to take care of something or somebody, especially children. 

  • Temporary possession or care of somebody else's property. 

  • The state of being imprisoned or detained, usually pending a trial. 

  • An area under the jurisdiction of a custos within the Order of Friars Minor. 

guardianship

noun
  • The office or position of one acting as a guardian or conservator, especially in a legal capacity. 

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