"Soeur" is the French word for "sister," and it can be used in a variety of contexts, whether referring to a biological sister or a sister figure. However, there are several synonyms for "soeur" that can be used to add variety and depth to your writing or conversation. For example, "frangine" is a popular slang term that can be used to refer to a close friend who feels like a sister. "Consoeur" is another term that is often used in professional settings to refer to female colleagues or members of a particular field or industry. Using synonyms for "soeur" can help convey different nuances and shades of meaning when discussing sisterhood and the important relationships in our lives.