A clerical gathering is often referred to as a convocation, symposium, or conference.
A gathering of nuns is called a nunnery. Or a convent.
A square clerical cap is called a biretta. This traditional headgear is commonly worn by clergy members, particularly in the Catholic Church, to signify their rank or office.
A large gathering of people is called a group, mob, crowd or a mass.
It is called a levee!
A nifty website called monster.com will let you search for administrative and clerical jobs, and by area as well. That should get you on your way. Good luck!
A clerical robe is commonly referred to as a cassock or a soutane. It is a long, ankle-length robe worn by clergy members, particularly in the Catholic and Anglican traditions.
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It is a Tribe.
A gathering
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A gathering of ten Jewish men (or women in reform and conservative Judaism) for the purpose of prayer is called a minyan.