pregnancy vs virility

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. 

virility

noun
  • The state of being virile. 

  • Manly character, quality, or nature. 

  • The ability of a man to procreate. 

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