Select the most appropriate one-word substitution for the given group of words.

Assembly of worshippers in one place 

Congregation

The most appropriate one-word substitution for "assembly of worshippers in one place" is congregation.

• Congestion is a crowded or obstructed state.
• Congregation is a gathering of people, especially for religious worship.
• Convocation is a formal meeting of a group of people, especially a religious or academic body.
• Cajole is to persuade someone to do something by using gentle persuasion or flattery.