cohabit vs engender

cohabit

verb
  • To coexist in common environs with. 

  • To live together with someone else, especially in a romantic and sexual relationship but without being married. 

engender

verb
  • To bring into existence (a situation, quality, result etc.); to give rise to, cause, create. 

  • To assume form; to come into existence; to be caused or produced. 

  • To give existence to, to produce (living creatures). 

  • To endow with gender; to create gender or enhance the importance of gender. 

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