fruitfulness vs pregnancy

fruitfulness

noun
  • The state or quality of being fruitful; exuberant abundance. 

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 fruitfulness and pregnancy occurred in a corpus of books? (source: Google Ngram Viewer )