Theater of war and War zone

Theater of war noun - The entire land, sea, and air area that may become or is directly involved in war operations.

War zone and theater of war are semantically related In some cases you can use "War zone" instead a noun phrase "Theater of war".

War zone noun - A combat zone where military operations are coordinated (especially a designated area in international waters where the rights of neutrals are not respected by nations at war).

Theater of war and war zone are semantically related in place of warring topic. You can use "Theater of war" instead a noun phrase "War zone".