There are several synonyms for the term "foster mother" that are often used interchangeably in literature and everyday conversation. One such synonym is "surrogate mother", which refers to a woman who raises and cares for a child that is not biologically her own. Another synonym that is commonly used is "adoptive mother", which refers to a woman who legally adopts a child and becomes their permanent parent. Other synonyms for "foster mother" include "guardian", "caretaker", "nanny" and "parental figure". The use of these synonyms can help to broaden our understanding of the different types of caregivers who play a vital role in raising and nurturing children.