Day of rest and Roundabout

Day of rest noun - A day set aside for rest.

Roundabout and day of rest are semantically related. In some cases you can use "Roundabout" instead a noun phrase "Day of rest".

Roundabout noun - A road junction at which traffic streams circularly around a central island.

Day of rest and roundabout are semantically related. Sometimes you can use "Day of rest" instead a noun "Roundabout".