Field of battle and Theatre of war

Field of battle noun - A region where a battle is being (or has been) fought.

Theatre of war and field of battle are semantically related. In some cases you can use "Theatre of war" instead a noun phrase "Field of battle".

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

Field of battle and theatre of war are semantically related. You can use "Field of battle" instead a noun phrase "Theatre of war".