birth vs fosterage

birth

noun
  • The process of childbearing; the beginning of life. 

  • A beginning or start; a point of origin. 

  • That which is born. 

  • An instance of childbirth. 

  • The circumstances of one's background, ancestry, or upbringing. 

adj
  • A familial relationship established by childbirth. 

verb
  • To bear or give birth to (a child). 

  • To produce, give rise to. 

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. 

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