maturation vs pregnancy

maturation

noun
  • The process of maturating, or suppurating fully. 

  • The process of becoming mature. 

  • The process of differentiation that produces the adult form of an organism. 

pregnancy

noun
  • The period of time this condition prevails. 

  • The progression of stages from conception to birth. 

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

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