If you are discussing the duties of your minister or rabbi, you are talking about his or her ministry — the work the religious leader does in serving a congregation. The noun ministry also refers to a group of clergy.
Even if you do not lead a religious community, you can still have a ministry, as the word means to provide information or services about an organization or cause. The charity can have a ministry to serve homeless people. The noun ministry can also refer to a government department. In the United Kingdom, for example, the Ministry of Defense oversees the armed forces. A ministry can also be the building where this sort of government work occurs.
