fosterage vs tutelage

fosterage

noun
  • The act of fostering another's child as if it were one's own. 

  • The act of promoting or encouraging something. 

  • The act of caring for another human being or animal. 

  • The condition of being the foster child. 

tutelage

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

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

  • Instruction; teaching; guidance. 

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