A good relationship among the people, brotherhood, companionship, comradeship, bonhomie, conviviality, togetherness:
There is a great sense of camaraderie among the teammates.
Confidant / confidante (noun)
Mothers are usually likely the first confidants of anybody.
You should have a strong personality if you do not have any confidants in your life.
Esprit de corps (noun)
Extroverted people would rather socialize with different folks from all walks of life.
Every fraternity usually has its own jargon, language and set of jokes.
clubbable, being a social butterfly, sociable: