Escape hatch and Emergency exit

Escape hatch noun - Hatchway that provides a means of escape in an emergency.

Emergency exit and escape hatch are semantically related. In some cases you can use "Emergency exit" instead a noun phrase "Escape hatch".

Emergency exit noun - A stairway (often on the outside of a building) that permits exit in the case of fire or other emergency.

Escape hatch and emergency exit are semantically related. You can use "Escape hatch" instead a noun phrase "Emergency exit".