Pier and Pylon

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

Pylon and pier are semantically related in column topic. In some cases you can use "Pylon" instead a noun "Pier".

Pylon noun - A large vertical steel tower supporting high-tension power lines.

Pier and pylon are semantically related in column topic. You can use "Pier" instead a noun "Pylon", if it concerns topics such as pillar.