Airlock and Lock chamber

Airlock noun - A chamber that provides access to space where air is under pressure.

Lock chamber and airlock are semantically related. In some cases you can use "Lock chamber" instead a noun "Airlock".

Lock chamber noun - Enclosure consisting of a section of canal that can be closed to control the water level; used to raise or lower vessels that pass through it.

Airlock and lock chamber are semantically related. You can use "Airlock" instead a noun phrase "Lock chamber".