When describing a person's biological mother, there are several synonyms that can be used in place of the term "natal mother." Some options include birth mother, biological mother, genetic mother, and natural mother. These terms all refer to the woman who gave birth to a particular individual and who shares a biological connection with them. It is important to note that while these terms are similar in meaning, there may be subtle differences in connotation or usage depending on the context. Nonetheless, they can all be used interchangeably to describe a person's biological mother.