The term "cousin-sister" refers to a female cousin who is considered to be like a sister. However, there are many alternative ways to refer to this type of relationship. Some synonyms for "cousin-sister" include "cousin-german," "first cousin," "sororal cousin," and "parallel cousin." Other terms used in different cultures and regions include "cross-cousin," "milk sister," "sworn sister," and "spiritual sister." These terms can vary depending on the language, culture, and specific familial relationships. Regardless of the term used, the meaning of a cousin-sister remains the same: a female cousin who is treated like a sister and holds a special place in a person's heart.