Select the option that can be used as a one-word substitute for the given group of words.

A group of worshippers

Congregation

The word that can be used as a one-word substitute for "a group of worshippers" is congregation.

• Posse is a group of people gathered together for a particular purpose, especially a group of people gathered by a sheriff to help him arrest someone.
• Caravan is a group of people or vehicles traveling together, especially for safety or protection.
• Constellation is a group of stars that appear to form a pattern in the sky.
• Congregation is a group of people who gather together for religious worship.

Congregation is the most appropriate word for the given group of words because it specifically refers to a group of people who gather together for religious worship. It is derived from the Latin word congregare, meaning "to gather together."