Ground zero and War zone

Ground zero noun - A thing or place that is of greatest importance to an activity or interest.

War zone and ground zero are semantically related. In some cases you can use "War zone" instead a noun phrase "Ground zero".

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).

Ground zero and war zone are semantically related. Sometimes you can use "Ground zero" instead a noun phrase "War zone".