What is a synonym for rotunda?

Here are some synonyms for rotunda, depending on the specific context:

General:

* Dome

* Circular hall

* Round building

* Circular room

* Cylinder

More specific:

* Ovoid (if it's egg-shaped)

* Rotunda (if it's a large, domed hall, particularly in a public building)

* Cupola (if it's a small, dome-shaped structure)

* Pantheon (if it's a large, round temple)

The best synonym for "rotunda" will depend on the specific context of the sentence.