Open-air and Outermost

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

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

Outermost adjective - Most distant from a center.

Open-air and outermost are semantically related. You can use "Open-air" instead an adjective "Outermost".