moderator
US /ˈmɑː.də.reɪ.t̬ɚ/
UK /ˈmɑː.də.reɪ.t̬ɚ/

1.
a person who presides over an assembly, meeting, or discussion and ensures that the rules of debate are adhered to
:
•
The moderator kept the debate fair and orderly.
•
She was chosen as the moderator for the town hall meeting.
2.
an online forum or community member who enforces rules and guidelines, and manages content
:
•
The forum moderator deleted the offensive post.
•
She spends hours every day as a volunteer moderator for a large online community.