Mob : a large crowd of people, especially one that is disorderly and intent on causing trouble or violence.
Group : a number of people or things that are located, gathered, or classed together.
Family : a group consisting of two parents and their children living together as a unit.
Institution : an organization founded for a religious, educational, professional, or social purpose.
Coterie : a small group of people with shared interests or tastes, especially one that is exclusive of other people.
Synonym of
Coterie is
Group