baba vs co-parent

baba

noun
  • A holy man, a spiritual leader. 

  • An old woman, especially a traditional old woman from an eastern European culture. 

  • A baby, child. 

  • A grandmother. 

  • A father. 

  • A kind of sponge cake soaked in rum-flavoured syrup. 

  • In baby talk, often used for a variety of words beginning with b, such as bottle or blanket. 

co-parent

noun
  • A godparent. 

  • A divorced or separated parent who shares custody with the other parent. 

  • A parent in a same-sex couple. 

  • Someone who shares in the parenting of a child or children, such as 

verb
  • To act as a co-parent; to share custody of a child or children; to share in the responsibility of parenting a child or children. 

How often have the words baba and co-parent occurred in a corpus of books? (source: Google Ngram Viewer )