protectorship vs tutelage

protectorship

noun
  • The office of a protector or regent; protectorate. 

tutelage

noun
  • The act of guarding, protecting, or guiding; guardianship; protection 

  • The state of being under a guardian or a tutor; care or protection enjoyed. 

  • Instruction; teaching; guidance. 

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