Airlock and Floodgate

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

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

Floodgate noun - Regulator consisting of a valve or gate that controls the rate of water flow through a sluice.

Airlock and floodgate are semantically related. You can use "Airlock" instead a noun "Floodgate".