childbearing vs pregnancy

childbearing

noun
  • The process of giving birth; pregnancy and parturition 

adj
  • Of, pertaining to, or suitable for childbirth 

pregnancy

noun
  • The condition of being pregnant; an instance of this. 

  • The progression of stages from conception to birth. 

  • The period of time this condition prevails. 

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