mammy

/M AE1 M IY0/
noun
  1. 1

    Mamma; mother

  2. 2

    (historical, often pejorative) In the southern United States, a black nanny employed to look after white children; or in the antebellum South, a female slave who was close to the household and looked after the children.

Source: https://en.wiktionary.org/wiki/mammy