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They are in most contexts.

There are "traffic circles" that aren't roundabouts but just a round block in the middle of an intersection that requires the traffic to move around in a circle so cross traffic is slowed. Also called a "traffic calming circle."

https://www.seattle.gov/transportation/projects-and-programs...

That could also be a location specific term too. These circles are very common in Seattle.

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I thought that was a roundabout. At least my UK family would call that a roundabout.

Roundabouts have to have splitters and other features that traffic calming circles lack. Also, technically you can go whichever way you want around a traffic calming circle: counterclockwise is recommended, but many trucks physically cannot navigate them that way. And there are zero traffic laws distinguishing a traffic calming circle from an uncontrolled intersection.

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