Catwalk and Pier

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

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

Pier noun - A structure used by boats and ships for taking on or landing cargo and passengers.

Catwalk and pier are semantically related. Sometimes you can use "Catwalk" instead a noun "Pier".