The term "daughter of a sister-in-law" refers to a niece. However, there are several other synonyms for this term, including "nibling," "niece-in-law," and "sister-niece." The word "nibling" is a gender-neutral term that can refer to either a niece or nephew, making it a useful word to have in your vocabulary. "Niece-in-law" is a less commonly used term that refers to the daughter of a spouse's sister. "Sister-niece," on the other hand, is a term used in some cultures to specifically refer to the daughter of a sister, rather than a sister-in-law. Regardless of the term used, a niece is a special family member who can bring joy and love into your life.