der Imam
imam
In Islam, the prayer leader who leads communal prayer in a mosque.
Der Imam rief die Gläubigen zum Freitagsgebet.
The imam called the believers to Friday prayer.

imam
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imam
In Islam, the prayer leader who leads communal prayer in a mosque.
Der Imam rief die Gläubigen zum Freitagsgebet.
The imam called the believers to Friday prayer.

The meaning of the word depends strongly on the Islamic denomination. In the context of Sunni Islam, the imam is the leader of communal prayer. In a Shia context, the imam refers to a historical leader of the community appointed by God.
In unserer Moschee leitet ein junger Imam das Freitagsgebet.
In our mosque, a young imam leads the Friday prayer.
'Der Imam' (the imam) is a masculine noun. It is used and declined in sentences like other masculine terms for people. The word comes from Arabic.
Wir haben den Imam nach seiner Meinung gefragt.
We asked the imam for his opinion.
When the prayer leader is meant, 'Imam' (imam) often appears with words that describe his function. Typical phrases are 'das Gebet leiten' (to lead the prayer), 'in der Moschee predigen' (to preach in the mosque), or 'zum Gebet rufen' (to call to prayer).
Der Imam leitet fünfmal am Tag das Gebet.
The imam leads the prayer five times a day.
preacher
'der Prediger' and 'der Imam' can both have to do with religious gatherings, but they are not the same thing. A 'Prediger' gives a sermon and proclaims religious teachings; the word is not tied to a specific religion. An 'Imam' is the prayer leader in Islam who leads communal prayer in the mosque. The words can be confused because both religious figures speak or act in front of a community. When the topic is preaching in general, 'Prediger' fits; when it is about Islamic prayer leadership in the mosque, 'Imam' is more precise.

Der Imam leitete am Freitag das Gebet in der Moschee.
The imam led the Friday prayer in the mosque.
Bei der religiösen Versammlung hörten alle dem Prediger aufmerksam zu.
At the religious gathering, everyone listened attentively to the preacher.