Command post and High command

Command post noun - The place from which a commander runs operations.

High command and command post are semantically related In some cases you can use "High command" instead a noun phrase "Command post".

High command noun - The highest leaders in an organization (e.g. the commander-in-chief and senior officers of the military).

Command post and high command are semantically related in center of operations topic. You can use "Command post" instead a noun phrase "High command".