privy

A privy is a small room or enclosure for private use, usually with a toilet. It can also mean someone who has secret information about something.

You might have heard of a privy council, which is a group of people who help make important decisions by giving advice to the person in charge. This type of privy is like an advisor or confidant. The word "privy" often comes from the idea that these councils were usually just for a few close friends and advisors, so they could discuss things without outsiders knowing what was going on.