co-parent vs parent

co-parent

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

  • A godparent. 

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

  • A parent in a same-sex couple. 

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. 

parent

noun
  • A person who acts as a parent in rearing a child; a step-parent or adoptive parent. 

  • A surrogate parent 

  • An organism from which a plant or animal is immediately biologically descended. 

  • A parent company. 

  • One of the two persons from whom one is immediately biologically descended; a mother or father. 

  • The object from which a child or derived object is descended; a node superior to another node. 

  • The nuclide that decays into a daughter nuclide. 

  • The source or origin of something. 

  • A third person who has provided DNA samples in an IVF procedure in order to alter faulty genetic material 

  • Sponsor, supporter, owner, protector. 

verb
  • To act as parent, to raise or rear. 

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