pregnancy vs puberty

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. 

puberty

noun
  • A developmental phase brought about by the action of hormones as part of the maturing process. For humans, there are three in total. 

  • The process of sexual development that produces secondary sex characteristics and makes a person capable of reproducing sexually. 

  • The period when a plant begins to flower. 

  • The age at which a person is first capable of sexual reproduction. 

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