Oval and Orbicular

Oval adjective - Having the shape of an egg.

Orbicular and oval are semantically related In some cases you can use "Orbicular" instead an adjective "Oval".

Orbicular adjective - Circular or nearly circular.

Oval and orbicular are semantically related in round topic. Sometimes you can use "Oval" instead an adjective "Orbicular", if it concerns topics such as curved, ball-shaped.