co-parent vs nurse

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. 

nurse

noun
  • A person (usually a woman) who takes care of other people’s young. 

  • One who, or that which, brings up, rears, causes to grow, trains, or fosters. 

  • A larva of certain trematodes, which produces cercariae by asexual reproduction. 

  • A shrub or tree that protects a young plant. 

  • A person trained to provide care for the sick. 

  • A lieutenant or first officer who takes command when the captain is unfit for his place. 

  • A nurse shark or dogfish. 

verb
  • To drink slowly, to make it last. 

  • To breastfeed: to be fed at the breast. 

  • To foster, to nourish. 

  • To manage with care and economy. 

  • To care for (someone), especially in sickness; to tend to. 

  • To breastfeed: to feed (a baby) at the breast; to suckle. 

  • To treat kindly and with extra care. 

  • To hold closely to one's chest 

  • To strike (billiard balls) gently, so as to keep them in good position during a series of shots. 

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