pregnancy vs pubescence

pregnancy

noun
  • The progression of stages from conception to birth. 

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

  • The period of time this condition prevails. 

pubescence

noun
  • The state of being in or reaching puberty. 

  • A covering of fine, soft hairs. 

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