Couloir and Catwalk

Couloir noun - A narrow opening between hillsides or mountains that can be used for passage.

Catwalk and couloir are semantically related. In some cases you can use "Catwalk" instead a noun "Couloir".

Catwalk noun - Narrow pathway high in the air (as above a stage or between parts of a building or along a bridge).

Couloir and catwalk are semantically related. Sometimes you can use "Couloir" instead a noun "Catwalk".