co-parent vs mama

co-parent

noun
  • A parent in a same-sex couple. 

  • A godparent. 

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

  • 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. 

mama

noun
  • Mother, female parent. 

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