https://www.merriam-webster.com/dictionary/wall
a
: a high thick masonry structure forming a long rampart or an enclosure chiefly for defense —often used in plural
b
: a masonry fence around a garden, park, or estate
c
: a structure that serves to hold back pressure (as of water or sliding earth)
https://www.merriam-webster.com/dictionary/fence
a
: a barrier intended to prevent escape or intrusion or to mark a boundary especially
: such a barrier made of posts and wire or boards
https://www.askdifference.com/fence-vs-wall/
Fence - noun
A thin artificial barrier that separates two pieces of land or a house perimeter.
An inclosure about a field or other space, or about any object; especially, an inclosing structure of wood, iron, or other material, intended to prevent intrusion from without or straying from within.
a barrier that serves to enclose an area
Wall - noun
A rampart of earth, stones etc. built up for defensive purposes.
A structure built for defense surrounding a city, castle etc.
An impediment to free movement.
A barrier.
Sounds like a fence is a wall, but a wall is not a fence.
This is the current boarder. This is a fence. This is not a wall. Hardly the type of structure the Füuhler described being built.
This is the boarder wall in Iisrael and Lebanon. This is a wall