Extramural and Open-air

Extramural adjective - Carried on outside the bounds of an institution or community.

Open-air and extramural are semantically related in external topic. In some cases you can use "Open-air" instead an adjective "Extramural".

Open-air adjective - Of, relating to, or held in the open air.

Extramural and open-air are semantically related in external topic. You can use "Extramural" instead an adjective phrase "Open-air".