Penumbra and Shadows

Penumbra noun - Partial darkness due to the obstruction of light rays.

Shadows and penumbra are semantically related in shadow topic. In some cases you can use "Shadows" instead a noun "Penumbra", when it comes to topics like dimness.

Penumbra and shadows are semantically related in shadow topic. You can use "Penumbra" instead a noun "Shadows", if it concerns topics such as darkness.