Blood-sister is a term commonly used to refer to a woman who shares the same biological parents as another. However, there are several other synonyms for the term that can be used. One alternative is "soul sister". This term signifies a bond that goes deeper than just blood, indicating a strong emotional connection between two women. Another synonym is "sister by birth". This term specifically refers to sisters who are related by birth, but it does not necessarily imply a close relationship. "Kindred spirit" is another synonym that indicates a deep connection between female friends or family members. These synonyms expand the meaning of the term beyond just biology and help to describe unique relationships between women.