Other forms: sodalities
A sodality is a group of people who share a common interest or career. Everyone who works as a firefighter is part of a large, supportive sodality.
The Latin root of sodality is sodalis, "companion," and you can think of these non-family groups as places to find companionship or fellowship. The word originally described Catholic guilds, and it grew to include other associations, like the ones formed by groups of plumbers or forestry workers or teachers. If you're a babysitter, you could even establish a sodality of child-minders that meets regularly to socialize and trade tips on entertaining toddlers!