A group of sisters is commonly called a Bond. Other collective nouns you may see include Clan and Troop.
A collective noun for sisters is a "sorority" or a "family." It signifies a group or gathered collection of sisters, whether formed by bloodline or by familial bonds. A sorority implies an organized group of females sharing common goals, experiences, and values, typically seen in educational or social settings. Similarly, a family, aside from denoting a biological unit, also represents a group of sisters coming together, offering support, sharing memories, and building lasting relationships. Ultimately, both terms encompass the notion of sisterhood, emphasizing unity, strength, and the deep bond that exists among these extraordinary women.
Known collective nouns for Sisters include: