Theater of operations and War zone

Theater of operations noun - A region in which active military operations are in progress.

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

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