There are several synonyms for the term "play mother," which refers to a person who plays the role of a mother but is not biologically related to the child. One synonym is "surrogate mother," which can also refer to a woman who carries and gives birth to a child for someone else. Another synonym is "foster mother," which refers to a woman who takes care of a child temporarily, often through the foster care system. "Adoptive mother" is also a synonym for "play mother," as it refers to a woman who legally becomes the mother of a child who is not biologically hers. Other possible synonyms include "auxiliary mother" and "substitute mother".