fosterage vs upbringing

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. 

upbringing

noun
  • The raising or training of a child. 

  • The traits acquired during one's childhood training 

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