What part ff speech is shown on the dictionary entry for word vestibule?

You're asking about the part of speech for the word "vestibule" as shown in a dictionary entry.

A dictionary entry usually indicates the part of speech for a word. However, without seeing the specific dictionary entry, it's impossible to say for sure.

However, "vestibule" is most commonly used as a noun. It refers to:

* A small entrance hall or lobby.

* A small space or chamber at the entrance of a building, especially one leading to a larger room.

Let me know if you have a specific dictionary entry you'd like me to look at!