minister:1 : AGENT
2 a : one officiating or assisting the officiant in church worship b : a clergyman especially of a Protestant communion
3 a : the superior of one of several religious orders ― called also minister-general b : the assistant to the rector or the bursar of a Jesuit house
4 : a high officer of state entrusted with the management of a division of governmental activities
5 a : a diplomatic representative (as an ambassador) accredited to the court or seat of government of a foreign state b : a diplomatic representative ranking below an ambassador
congregation: 1 a : an assembly of persons : GATHERING especially : an assembly of persons met for worship and religious instruction b : a religious community: as (1) : an organized body of believers in a particular locality (2) : a Roman Catholic religious institute with only simple vows (3) : a group of monasteries forming an independent subdivision of an order
2 : the act or an instance of congregating or bringing together : the state of being congregated
3 : a body of cardinals and officials forming an administrative division of the papal curia